The Sony a1 or Alpha 1 as it is also known, is Sony’s flagship camera with a stacked 50MP sensor capable of shooting up to 30 FPS and 8k video.
To keep up with the larger files and faster frame rate, the Sony a1 supports the much faster CFexpress Type-A memory cards in both slots.
Fortunately UHS-I and UHS-II SD cards are also supported because CFexpress Type A cards are not cheap, but then neither is the a1.
In this article I’ve speed tested two CFexpress Type-A cards (the only two on the market), along with 10 UHS-II cards in-camera, since in-camera write speeds don’t always match what’s on the card label.
Please be warned, there is a lot of data crunching in this article as I wanted to test all of the different file formats and drive modes of the a1, apart from Lo (5 fps) because no one should be buying the a1 to shoot at this speed! Also my sanity couldn’t take any more tests.
Sony a1 Forum & Facebook Group
If you are looking for further help and advice on the a1 or would simply like to share your photos and videos, then please head over to our new Sony A1 Forum. If you prefer Facebook then I also run the Sony A1 Shooters Group.
Table of Contents[Hide][Show]
- What Memory Cards are Supported?
Top 10 UHS-II Memory Cards & Buffer Tests+−
- 1. Kingston Canvas React Plus UHS-II SDXC Memory Card (300/260)
- 2. Sony SF-G Tough UHS-II (300/299)
- 3. ProGrade V90 UHS-II (300/250)
- 4. SanDisk Extreme Pro UHS-II (300/260)
- 5. Delkin Devices 64GB POWER UHS-II SDXC (300/250)
- 6. Angelbird AV Pro Mk 2 V90 (300/280)
- 7. Sony SF-M Tough UHS-II (277/150)
- 8. Sony SF-M UHS-II (277/150)
- 9. Lexar Professional 2000X UHS-II (300/260)
- 10. Transcend SD 700S UHS-II (285/180)
- Memory Cards for Recording Video
- Memory Cards for S&Q Motion Shooting
- What Size Memory Card Do You Need?
- How Many Images Can Be Recorded on a Memory Card?
- Movie Record Times
- Simultaneous Recording Slot 1 + Slot 2
- Summary
- FAQs
What Memory Cards are Supported?
The Sony a1 supports CFexpress Type A memory cards in both slots. UHS-I and UHS-II (SDHC/SDXC) SD cards are also supported in both card slots, but not at the same time as the CFexpress cards.
CFexpress Type-A Memory Cards & Buffer Tests
Although CFexpress is an open standard, Sony and ProGrade are the only manufacturers producing this type of card right now. Which they are unfortunately taking advantage of because the price is sky high!
If you shoot a lot of continuous bursts and demand the fastest buffer clearing times then these are the cards that you will probably want to be using in your a1.
1. Sony CEA-G CFexpress Type-A (800/700)
The Sony CEA-G Series CFexpress Type A memory cards can write up to 700MB/s and read up to 800MB/s. This Tough version has been rigidity tested to 150 newtons to protect your card data during drops from up to 7.5 meters, this is 5 times what the CFexpress Type A standard requires. They are also IP57 rated for dust and moisture protection and should even make it through an accidental cycle in the washing machine! There are 80GB and 160GB cards available.
In-Camera Speed & Buffer Test Results
When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 600 MB/s.
Here are my in-camera speed test results using a 160GB card:
Drive Mode Hi+ (Max 30fps)
Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) – 20 fps | 87 | 11.45 |
| Compressed RAW (54.2MB) – 30 fps | 152 | 9.80 |
| Lossless Compressed RAW (59.5MB) – 20 fps | 105 | 6.11 |
| JPEG Extra Fine (26MB) – 30 fps | 133 | 7.05 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps | 75 | 14.26 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps | 125 | 15.10 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps | 85 | 9.75 |
| HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps | 161 | 5.61 |
| HEIF (4:2:2) Extra Fine (18 MB) – 30 fps | 161 | 5.61 |
Drive Mode Hi (Max 20fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 87 | 11.45 |
| Compressed RAW (54.2MB) | 265 | 11.45 |
| Lossless Compressed RAW (59.5MB) | 105 | 6.11 |
| JPEG Extra Fine (26MB) | 210 | 6.93 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 75 | 14.26 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 146 | 14.96 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 85 | 9.75 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 299 | 6.25 |
| HEIF (4:2:2) Extra Fine (18 MB) | 299 | 6.25 |
Drive Mode Mid (Max 15fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 102 | 11.45 |
| Compressed RAW (54.2MB) | 449 | 11.45 |
| Lossless Compressed RAW (59.5MB) | 183 | 6.18 |
| JPEG Extra Fine (26MB) | 474 | 6.70 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 84 | 14.16 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 178 | 15.15 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 100 | 9.63 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | Never hits buffer | < 2.00 |
| HEIF (4:2:2) Extra Fine (18 MB) | Never hits buffer | < 2.00 |
2. ProGrade Digital CFexpress Type A Cobalt (800/700)
The ProGrade Digital CFexpress Type A Cobalt Memory Card can write up 700MB/s and read up to 800MB/s just like the Sony cards. Although not as tough as the Sony cards the metal enclosure/encasement has been designed to endure high temperatures while providing better thermal conductivity. The only capacity currently available is 160GB.
In-Camera Speed & Buffer Test Results
When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 600 MB/s. Here are my in-camera speed test results using a 160GB card:
Drive Mode Hi+ (Max 30fps)
Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) – 20 fps | 87 | 11.46 |
| Compressed RAW (54.2MB) – 30 fps | 152 | 9.90 |
| Lossless Compressed RAW (59.5MB) – 20 fps | 105 | 6.11 |
| JPEG Extra Fine (26MB) – 30 fps | 127 | 7.85 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps | 75 | 14.73 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps | 117 | 15.03 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps | 72 | 9.50 |
| HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps | 161 | 6.23 |
| HEIF (4:2:2) Extra Fine (18 MB) – 30 fps | 161 | 6.23 |
Drive Mode Hi (Max 20fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 87 | 11.46 |
| Compressed RAW (54.2MB) | 265 | 11.51 |
| Lossless Compressed RAW (59.5MB) | 105 | 6.11 |
| JPEG Extra Fine (26MB) | 210 | 6.95 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 75 | 14.27 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 146 | 14.92 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 85 | 9.75 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 299 | 6.25 |
| HEIF (4:2:2) Extra Fine (18 MB) | 299 | 6.25 |
Drive Mode Mid (Max 15fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 102 | 11.46 |
| Compressed RAW (54.2MB) | 449 | 11.46 |
| Lossless Compressed RAW (59.5MB) | 183 | 6.18 |
| JPEG Extra Fine (26MB) | 474 | 6.70 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 84 | 14.17 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 178 | 15.15 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 100 | 9.63 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | Never hits buffer | < 2.00 |
| HEIF (4:2:2) Extra Fine (18 MB) | Never hits buffer | < 2.00 |
Top 10 UHS-II Memory Cards & Buffer Tests
The Sony a1 also supports UHS-I and UHS-II memory cards. Here are my top 10 recommendations based on my in-camera speed/buffer tests:
1. Kingston Canvas React Plus UHS-II SDXC Memory Card (300/260)
Kingston have been in the memory business since 1987, so it’s safe to say they know a thing or two about memory!
Their Canvas React Plus UHS-II SDXC cards have a claimed read speed of 300MB/s and a write speed of 290MB/s. In-camera they write at the same speed (260MBs) as the Sony SF-G Tough cards but they are typically priced around 40% less for a 64GB card and also currently include a UHS-II card reader.
They receive very positive reviews and appear to be just as reliable as the Sony and SanDisk cards. They are V90 rated and available in 32GB (SDHC), 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.
In-Camera Speed & Buffer Test Results
When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 260 MB/s. Here are my in-camera speed test results using a 64GB card:
Drive Mode Hi+ (Max 30fps)
Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) – 20 fps | 73 | 25.83 |
| Compressed RAW (54.2MB) – 30 fps | 150 | 26.55 |
| Lossless Compressed RAW (59.5MB) – 20 fps | 82 | 14.26 |
| JPEG Extra Fine (26MB) – 30 fps | 154 | 12.19 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps | 69 | 31.96 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps | 113 | 32.66 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps | 70 | 21.13 |
| HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps | 164 | 5.41 |
| HEIF (4:2:2) Extra Fine (18 MB) – 30 fps | 164 | 5.41 |
Drive Mode Hi (Max 20fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 73 | 25.83 |
| Compressed RAW (54.2MB) | 166 | 27.80 |
| Lossless Compressed RAW (59.5MB) | 82 | 14.26 |
| JPEG Extra Fine (26MB) | 160 | 16.23 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 69 | 31.96 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 118 | 35.72 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 70 | 21.13 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 305 | 5.86 |
| HEIF (4:2:2) Extra Fine (18 MB) | 313 | 6.93 |
Drive Mode Mid (Max 15fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 78 | 26.36 |
| Compressed RAW (54.2MB) | 185 | 28.17 |
| Lossless Compressed RAW (59.5MB) | 86 | 15.80 |
| JPEG Extra Fine (26MB) | 196 | 15.86 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 70 | 33.96 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 125 | 36.81 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 73 | 23.80 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | Never hits buffer | < 2.00 |
| HEIF (4:2:2) Extra Fine (18 MB) | 1405 | 8.76 |
These cards are only marginally faster than the Sony SF-G Tough memory cards but in the US and the UK they are around 40 percent cheaper. Unless you need the tougher construction of the Sony Tough cards then these are the UHS-II cards that I would recommend for the a1.
2. Sony SF-G Tough UHS-II (300/299)
The Sony SF-G Tough cards have a claimed read speed of 300MB/s and a write speed of 299MB/s. They are V90 rated and available in 32GB (SDHC), 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.
The Sony Tough series of memory cards are 18 times stronger than traditional SD cards, bend proof to 180N, drop-proof to 5 meters, waterproof to a depth of 5 meters for up to 72 hours (IPX8 rating) and dust proof with an IP6X rating.
Tough cards feature a one-piece ribless structure and don’t have the common lock switch, they are also X-ray proof, magnet proof, anti-static and temperature proof.
Very Important Note: Old versions of these cards do not work with the a1. I get a message that says: “Unable to use Memory Card. Slot 1″. Sony has a replacement program for older versions of these cards due to VSC mode (Video Speed Class) issues where recorded footage on the card may be damaged or may not be recorded optimally. You can find out if your cards are affected by checking this article.
In-Camera Speed & Buffer Test Results
When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 260 MB/s. Here are my in-camera speed test results using a 64GB card:
Drive Mode Hi+ (Max 30fps)
Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) – 20 fps | 73 | 25.20 |
| Compressed RAW (54.2MB) – 30 fps | 150 | 27.30 |
| Lossless Compressed RAW (59.5MB) – 20 fps | 81 | 15.33 |
| JPEG Extra Fine (26MB) – 30 fps | 129 | 14.02 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps | 69 | 33.40 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps | 112 | 28.84 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps | 74 | 18.76 |
| HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps | 158 | 5.80 |
| HEIF (4:2:2) Extra Fine (18 MB) – 30 fps | 159 | 6.26 |
Drive Mode Hi (Max 20fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 73 | 25.20 |
| Compressed RAW (54.2MB) | 166 | 27.43 |
| Lossless Compressed RAW (59.5MB) | 81 | 15.33 |
| JPEG Extra Fine (26MB) | 162 | 15.13 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 69 | 33.40 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 121 | 28.91 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 74 | 18.76 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 276 | 5.93 |
| HEIF (4:2:2) Extra Fine (18 MB) | 314 | 6.38 |
Drive Mode Mid (Max 15fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 76 | 26.16 |
| Compressed RAW (54.2MB) | 183 | 27.55 |
| Lossless Compressed RAW (59.5MB) | 89 | 15.43 |
| JPEG Extra Fine (26MB) | 201 | 15.76 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 72 | 29.71 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 133 | 28.91 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 78 | 18.61 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | Never hits buffer | < 2.00 |
| HEIF (4:2:2) Extra Fine (18 MB) | Never hits buffer | < 2.00 |
3. ProGrade V90 UHS-II (300/250)
The ProGrade V90 cards have a claimed read speed of 300MB/s and a write speed of 250MB/s. They are V90 rated and available in 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.
In-Camera Speed & Buffer Test Results
When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 257 MB/s. Here are my in-camera speed test results using a 64GB card:
Drive Mode Hi+ (Max 30fps)
Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) – 20 fps | 72 | 26.63 |
| Compressed RAW (54.2MB) – 30 fps | 149 | 27.66 |
| Lossless Compressed RAW (59.5MB) – 20 fps | 80 | 15.37 |
| JPEG Extra Fine (26MB) – 30 fps | 141 | 13.83 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps | 68 | 34.06 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps | 110 | 35.45 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps | 70 | 22.73 |
| HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps | 160 | 5.55 |
| HEIF (4:2:2) Extra Fine (18 MB) – 30 fps | 159 | 5.70 |
Drive Mode Hi (Max 20fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 72 | 26.63 |
| Compressed RAW (54.2MB) | 164 | 27.60 |
| Lossless Compressed RAW (59.5MB) | 80 | 15.37 |
| JPEG Extra Fine (26MB) | 173 | 13.81 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 68 | 34.06 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 117 | 35.21 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 70 | 22.73 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 301 | 5.50 |
| HEIF (4:2:2) Extra Fine (18 MB) | 299 | 5.58 |
Drive Mode Mid (Max 15fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 77 | 26.88 |
| Compressed RAW (54.2MB) | 183 | 27.63 |
| Lossless Compressed RAW (59.5MB) | 88 | 15.40 |
| JPEG Extra Fine (26MB) | 232 | 13.96 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 70 | 33.75 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 125 | 35.51 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 75 | 22.90 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | Never hits buffer | < 2.00 |
| HEIF (4:2:2) Extra Fine (18 MB) | Never hits buffer | < 2.00 |
4. SanDisk Extreme Pro UHS-II (300/260)
The SanDisk Extreme Pro cards have a claimed read speed of 300MB/s and a write speed of 260MB/s. They are V90 rated and available in 32GB (SDHC), 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.
In-Camera Speed & Buffer Test Results
When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 247 MB/s. Here are my in-camera speed test results using a 64GB card:
Drive Mode Hi+ (Max 30fps)
Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) – 20 fps | 70 | 25.50 |
| Compressed RAW (54.2MB) – 30 fps | 145 | 27.91 |
| Lossless Compressed RAW (59.5MB) – 20 fps | 81 | 15.57 |
| JPEG Extra Fine (26MB) – 30 fps | 137 | 14.28 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps | 66 | 34.36 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps | 110 | 36.26 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps | 70 | 23.62 |
| HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps | 154 | 5.81 |
| HEIF (4:2:2) Extra Fine (18 MB) – 30 fps | 160 | 6.48 |
Drive Mode Hi (Max 20fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 70 | 25.50 |
| Compressed RAW (54.2MB) | 164 | 27.90 |
| Lossless Compressed RAW (59.5MB) | 81 | 15.57 |
| JPEG Extra Fine (26MB) | 171 | 14.71 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 66 | 34.36 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 116 | 36.88 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 70 | 23.62 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 337 | 5.66 |
| HEIF (4:2:2) Extra Fine (18 MB) | 354 | 6.78 |
Drive Mode Mid (Max 15fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 77 | 25.76 |
| Compressed RAW (54.2MB) | 182 | 27.81 |
| Lossless Compressed RAW (59.5MB) | 87 | 15.50 |
| JPEG Extra Fine (26MB) | 212 | 14.63 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 71 | 34.85 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 124 | 36.28 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 70 | 23.83 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | Never hits buffer | < 2.00 |
| HEIF (4:2:2) Extra Fine (18 MB) | Never hits buffer | < 2.00 |
Very Important Note: Older versions of this card are not V90 rated and therefore will not work in certain video modes. See the video section of this guide for details on which video file formats require V90 rated cards.
5. Delkin Devices 64GB POWER UHS-II SDXC (300/250)
The Delkin Devices 64GB POWER UHS-II SDXC memory cards support read speeds of up to 300 MB/s and write speeds of 250 MB/s. They are also V90 rated for video. They are available in 32GB (SDHC), 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.
In-Camera Speed & Buffer Test Results
When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 246 MB/s. Here are my in-camera speed test results using a 64GB card:
Drive Mode Hi+ (Max 30fps)
Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) – 20 fps | 71 | 27.56 |
| Compressed RAW (54.2MB) – 30 fps | 150 | 29.43 |
| Lossless Compressed RAW (59.5MB) – 20 fps | 76 | 17.53 |
| JPEG Extra Fine (26MB) – 30 fps | 124 | 17.08 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps | 67 | 37.08 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps | 110 | 41.18 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps | 66 | 26.07 |
| HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps | 163 | 7.20 |
| HEIF (4:2:2) Extra Fine (18 MB) – 30 fps | 144 | 8.86 |
Drive Mode Hi (Max 20fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 71 | 27.56 |
| Compressed RAW (54.2MB) | 163 | 29.33 |
| Lossless Compressed RAW (59.5MB) | 76 | 17.53 |
| JPEG Extra Fine (26MB) | 153 | 18.26 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 67 | 37.08 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 116 | 41.18 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 66 | 26.07 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 274 | 7.61 |
| HEIF (4:2:2) Extra Fine (18 MB) | 222 | 8.64 |
Drive Mode Mid (Max 15fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 76 | 27.99 |
| Compressed RAW (54.2MB) | 180 | 29.95 |
| Lossless Compressed RAW (59.5MB) | 86 | 16.81 |
| JPEG Extra Fine (26MB) | 179 | 18.35 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 70 | 37.52 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 122 | 41.03 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 73 | 27.06 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 827 | 7.83 |
| HEIF (4:2:2) Extra Fine (18 MB) | 473 | 8.48 |
6. Angelbird AV Pro Mk 2 V90 (300/280)
The Angelbird AV Pro Mk 2 V90 UHS-II memory cards support read speeds of up to 300 MB/s and write speeds of 280 MB/s. They are also V90 rated so they guarantee a minimum write speed of 90 MB/s. They are available in 32GB (SDHC), 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.
In-Camera Speed & Buffer Test Results
When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 246 MB/s. Here are my in-camera speed test results using a 64GB card:
Drive Mode Hi+ (Max 30fps)
Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) – 20 fps | 70 | 27.11 |
| Compressed RAW (54.2MB) – 30 fps | 148 | 28.46 |
| Lossless Compressed RAW (59.5MB) – 20 fps | 79 | 16.08 |
| JPEG Extra Fine (26MB) – 30 fps | 130 | 15.13 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps | 67 | 35.36 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps | 110 | 38.20 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps | 73 | 19.41 |
| HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps | 163 | 5.51 |
| HEIF (4:2:2) Extra Fine (18 MB) – 30 fps | 159 | 5.60 |
Drive Mode Hi (Max 20fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 70 | 27.11 |
| Compressed RAW (54.2MB) | 163 | 28.46 |
| Lossless Compressed RAW (59.5MB) | 79 | 16.08 |
| JPEG Extra Fine (26MB) | 165 | 15.23 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 67 | 35.36 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 116 | 37.70 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 73 | 19.41 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 289 | 5.78 |
| HEIF (4:2:2) Extra Fine (18 MB) | 189 | 5.58 |
Drive Mode Mid (Max 15fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 76 | 26.98 |
| Compressed RAW (54.2MB) | 181 | 28.34 |
| Lossless Compressed RAW (59.5MB) | 86 | 15.95 |
| JPEG Extra Fine (26MB) | 199 | 15.36 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 69 | 34.91 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 122 | 37.67 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 79 | 19.53 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | Never hits buffer | < 2.00 |
| HEIF (4:2:2) Extra Fine (18 MB) | Never hits buffer | < 2.00 |
7. Sony SF-M Tough UHS-II (277/150)
Sony’s SF-M Tough Series are similar to the more expensive SF-G version but these are only rated V60 for video and their read time has been cut to 277MB/s and the write time to 150MB/s. They are available in 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.
Very Important Note: Old versions of these cards do not work with the a1. I get a message that says: “Unable to use Memory Card. Slot 1″. Sony has a replacement program for older versions of these cards due to VSC mode (Video Speed Class) issues where recorded footage on the card may be damaged or may not be recorded optimally. You can find out if your cards are affected by checking this article.
In-Camera Speed & Buffer Test Results
When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 150 MB/s. Here are my in-camera speed test results using a 64GB card:
Drive Mode Hi+ (Max 30fps)
Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) – 20 fps | 70 | 46.87 |
| Compressed RAW (54.2MB) – 30 fps | 140 | 48.48 |
| Lossless Compressed RAW (59.5MB) – 20 fps | 73 | 27.16 |
| JPEG Extra Fine (26MB) – 30 fps | 126 | 26.52 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps | 66 | 60.23 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps | 108 | 63.85 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps | 67 | 41.20 |
| HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps | 141 | 9.80 |
| HEIF (4:2:2) Extra Fine (18 MB) – 30 fps | 134 | 11.37 |
Drive Mode Hi (Max 20fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 70 | 46.87 |
| Compressed RAW (54.2MB) | 147 | 48.10 |
| Lossless Compressed RAW (59.5MB) | 73 | 27.16 |
| JPEG Extra Fine (26MB) | 137 | 26.73 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 66 | 60.23 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 111 | 63.34 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 67 | 41.20 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 189 | 10.03 |
| HEIF (4:2:2) Extra Fine (18 MB) | 115 | 11.06 |
Drive Mode Mid (Max 15fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 72 | 46.77 |
| Compressed RAW (54.2MB) | 155 | 47.67 |
| Lossless Compressed RAW (59.5MB) | 77 | 27.10 |
| JPEG Extra Fine (26MB) | 150 | 26.65 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 67 | 59.35 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 114 | 62.77 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 69 | 40.96 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 291 | 10.13 |
| HEIF (4:2:2) Extra Fine (18 MB) | 228 | 11.25 |
8. Sony SF-M UHS-II (277/150)
Sony’s SF-M Series are identical to the SF-M Tough Series just without the added toughness so they cost a little less. The Sony SF-M cards have a claimed read speed of 277MB/s and a write speed of 150MB/s. They are V60 rated and available in 64GB (SDXC), 128GB (SDXC) and 256GB (SDXC) sizes.
Very Important Note: Old versions of these cards do not work with the a1. I get a message that says: “Unable to use Memory Card. Slot 1″. Sony has a replacement program for older versions of these cards due to VSC mode (Video Speed Class) issues where recorded footage on the card may be damaged or may not be recorded optimally. You can find out if your cards are affected by checking this article.
In-Camera Speed & Buffer Test Results
When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 150 MB/s. Here are my in-camera speed test results using a 64GB card:
Drive Mode Hi+ (Max 30fps)
Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) – 20 fps | 70 | 46.87 |
| Compressed RAW (54.2MB) – 30 fps | 140 | 48.48 |
| Lossless Compressed RAW (59.5MB) – 20 fps | 73 | 27.16 |
| JPEG Extra Fine (26MB) – 30 fps | 126 | 26.52 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps | 66 | 60.23 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps | 108 | 63.85 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps | 67 | 41.20 |
| HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps | 141 | 9.80 |
| HEIF (4:2:2) Extra Fine (18 MB) – 30 fps | 134 | 11.37 |
Drive Mode Hi (Max 20fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 70 | 46.87 |
| Compressed RAW (54.2MB) | 147 | 48.10 |
| Lossless Compressed RAW (59.5MB) | 73 | 27.16 |
| JPEG Extra Fine (26MB) | 137 | 26.73 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 66 | 60.23 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 111 | 63.34 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 67 | 41.20 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 189 | 10.03 |
| HEIF (4:2:2) Extra Fine (18 MB) | 115 | 11.06 |
Drive Mode Mid (Max 15fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 72 | 46.77 |
| Compressed RAW (54.2MB) | 155 | 47.67 |
| Lossless Compressed RAW (59.5MB) | 77 | 27.10 |
| JPEG Extra Fine (26MB) | 150 | 26.65 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 67 | 59.35 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 114 | 62.77 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 69 | 40.96 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 291 | 10.13 |
| HEIF (4:2:2) Extra Fine (18 MB) | 228 | 11.25 |
9. Lexar Professional 2000X UHS-II (300/260)
The Lexar Professional 2000X cards have a claimed read speed of 300MB/s and a write speed of 260MB/s. They are V90 rated and available in 32GB (SDHC), 64GB (SDXC), 128GB (SDXC) sizes.
In-Camera Speed & Buffer Test Results
When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 141 MB/s. Here are my in-camera speed test results using a 64GB card:
Drive Mode Hi+ (Max 30fps)
Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) – 20 fps | 70 | 50.49 |
| Compressed RAW (54.2MB) – 30 fps | 137 | 54.57 |
| Lossless Compressed RAW (59.5MB) – 20 fps | 69 | 30.51 |
| JPEG Extra Fine (26MB) – 30 fps | 121 | 33.15 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps | 66 | 67.68 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps | 107 | 73.60 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps | 66 | 49.90 |
| HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps | 120 | 14.97 |
| HEIF (4:2:2) Extra Fine (18 MB) – 30 fps | 120 | 15.63 |
Drive Mode Hi (Max 20fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 70 | 50.49 |
| Compressed RAW (54.2MB) | 142 | 54.00 |
| Lossless Compressed RAW (59.5MB) | 69 | 30.51 |
| JPEG Extra Fine (26MB) | 131 | 33.48 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 66 | 67.68 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 110 | 73.70 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 66 | 49.90 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 148 | 13.41 |
| HEIF (4:2:2) Extra Fine (18 MB) | 139 | 15.50 |
Drive Mode Mid (Max 15fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 71 | 51.25 |
| Compressed RAW (54.2MB) | 152 | 53.34 |
| Lossless Compressed RAW (59.5MB) | 76 | 30.71 |
| JPEG Extra Fine (26MB) | 140 | 33.28 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 66 | 68.17 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 111 | 73.70 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 67 | 48.97 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 185 | 13.63 |
| HEIF (4:2:2) Extra Fine (18 MB) | 166 | 15.50 |
Based on these results it looks like the Lexar Professional 2000X is underperforming in the a1 for some reason, as they should be capable of writing faster than the results we see here.
10. Transcend SD 700S UHS-II (285/180)
The Transcend SD 700S cards have a claimed read speed of 285MB/s and a write speed of 180MB/s. They are V90 rated and available in 32GB (SDHC), 64GB (SDXC) sizes.
In-Camera Speed & Buffer Test Results
When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 140 MB/s. Here are my in-camera speed test results using a 64GB card:
Drive Mode Hi+ (Max 30fps)
Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) – 20 fps | 69 | 49.58 |
| Compressed RAW (54.2MB) – 30 fps | 139 | 53.25 |
| Lossless Compressed RAW (59.5MB) – 20 fps | 72 | 28.61 |
| JPEG Extra Fine (26MB) – 30 fps | 129 | 24.23 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) – 20 fps | 66 | 60.78 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) – 30 fps | 107 | 65.47 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) – 20 fps | 99 | 41.45 |
| HEIF (4:2:0) Extra Fine (15.7 MB) – 30 fps | 133 | 10.95 |
| HEIF (4:2:2) Extra Fine (18 MB) – 30 fps | 133 | 11.30 |
Drive Mode Hi (Max 20fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 69 | 49.58 |
| Compressed RAW (54.2MB) | 145 | 53.22 |
| Lossless Compressed RAW (59.5MB) | 72 | 28.61 |
| JPEG Extra Fine (26MB) | 141 | 24.21 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 66 | 60.78 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 111 | 63.63 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 99 | 41.45 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 192 | 10.85 |
| HEIF (4:2:2) Extra Fine (18 MB) | 172 | 10.88 |
Drive Mode Mid (Max 15fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (108.3MB) | 71 | 49.67 |
| Compressed RAW (54.2MB) | 153 | 53.50 |
| Lossless Compressed RAW (59.5MB) | 77 | 27.36 |
| JPEG Extra Fine (26MB) | 157 | 24.11 |
| Uncompressed RAW (108.3MB) + JPEG Extra Fine (26MB) | 66 | 61.37 |
| Compressed RAW (54.2MB) + JPEG Extra Fine (26MB) | 115 | 64.32 |
| Lossless Compressed RAW (59.5MB) + JPEG Extra Fine (26MB) | 69 | 41.51 |
| HEIF (4:2:0) Extra Fine (15.7 MB) | 312 | 9.61 |
| HEIF (4:2:2) Extra Fine (18 MB) | 244 | 11.06 |
APS-C Mode Buffer Tests
If you shoot in APS-C mode (21MP) then you might be interested in how many shots you can take before hitting the buffer and the clearing time.
For my own sanity I’ve only tested two cards: the Sony CEA-G CFexpress Type-A Card and the Sony SF-G Tough UHS-II Card.
Sony CEA-G CFexpress Type-A Card
When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 600 MB/s. Here are my in-camera speed test results using a 160GB card:
Drive Mode Hi+ (Max 30fps)
Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (44.4MB) – 20 fps | 323 | 8.06 |
| Compressed RAW (23.1MB) – 30 fps | 351 | 8.70 |
| Lossless Compressed RAW (26.4MB) – 20 fps | 465 | 5.58 |
| JPEG Extra Fine (11.1MB) – 30 fps | 444 | 8.66 |
| Uncompressed RAW (44.4MB) + JPEG Extra Fine (11.1MB) – 20 fps | 204 | 9.90 |
| Compressed RAW (23.1MB) + JPEG Extra Fine (11.1MB) – 30 fps | 346 | 11.70 |
| Lossless Compressed RAW (26.4MB) + JPEG Extra Fine (11.1MB) – 20 fps | 381 | 7.31 |
| HEIF (4:2:0) Extra Fine (4.2 MB) – 30 fps | 444 | 8.51 |
| HEIF (4:2:2) Extra Fine (4.9 MB) – 30 fps | 426 | 8.68 |
Drive Mode Hi (Max 20fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (44.4MB) | 323 | 8.06 |
| Compressed RAW (23.1MB) | Never hits buffer | < 2.00 |
| Lossless Compressed RAW (26.4MB) | 465 | 5.58 |
| JPEG Extra Fine (11.1MB) | Never hits buffer | < 2.00 |
| Uncompressed RAW (44.4MB) + JPEG Extra Fine (11.1MB) | 204 | 9.90 |
| Compressed RAW (23.1MB) + JPEG Extra Fine (11.1MB) | 827 | 11.88 |
| Lossless Compressed RAW (26.4MB) + JPEG Extra Fine (11.1MB) | 381 | 7.31 |
| HEIF (4:2:0) Extra Fine (4.2 MB) | Never hits buffer | < 2.00 |
| HEIF (4:2:2) Extra Fine (4.9 MB) | Never hits buffer | < 2.00 |
Drive Mode Mid (Max 15fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (44.4MB) | 1090 | 8.66 |
| Compressed RAW (23.1MB) | Never hits buffer | < 2.00 |
| Lossless Compressed RAW (26.4MB) | Never hits buffer | < 2.00 |
| JPEG Extra Fine (11.1MB) | Never hits buffer | < 2.00 |
| Uncompressed RAW (44.4MB) + JPEG Extra Fine (11.1MB) | 349 | 9.70 |
| Compressed RAW (23.1MB) + JPEG Extra Fine (11.1MB) | Never hits buffer | < 2.00 |
| Lossless Compressed RAW (26.4MB) + JPEG Extra Fine (11.1MB) | Never hits buffer | < 2.00 |
| HEIF (4:2:0) Extra Fine (4.2 MB) | Never hits buffer | < 2.00 |
| HEIF (4:2:2) Extra Fine (4.9 MB) | Never hits buffer | < 2.00 |
Sony SF-G Tough UHS-II
When shooting uncompressed raw to slot 1 in manual mode/focus with a shutter speed of 1/250th the in-camera write speed is around 260 MB/s. Here are my in-camera speed test results using a 64GB card:
Drive Mode Hi+ (Max 30fps)
Please note that the maximum speed of 30 fps is only possible in compressed RAW, JPEG and HEIF file formats.
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (44.4MB) – 20 fps | 149 | 17.75 |
| Compressed RAW (23.1MB) – 30 fps | 330 | 18.18 |
| Lossless Compressed RAW (26.4MB) – 20 fps | 211 | 10.55 |
| JPEG Extra Fine (11.1MB) – 30 fps | 421 | 8.91 |
| Uncompressed RAW (44.4MB) + JPEG Extra Fine (11.1MB) – 20 fps | 133 | 22.10 |
| Compressed RAW (23.1MB) + JPEG Extra Fine (11.1MB) – 30 fps | 243 | 24.55 |
| Lossless Compressed RAW (26.4MB) + JPEG Extra Fine (11.1MB) – 20 fps | 153 | 15.35 |
| HEIF (4:2:0) Extra Fine (4.2 MB) – 30 fps | 427 | 8.75 |
| HEIF (4:2:2) Extra Fine (4.9 MB) – 30 fps | 627 | 8.80 |
Drive Mode Hi (Max 20fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (44.4MB) | 149 | 17.75 |
| Compressed RAW (23.1MB) | 504 | 18.45 |
| Lossless Compressed RAW (26.4MB) | 211 | 10.55 |
| JPEG Extra Fine (11.1MB) | Never hits buffer | < 2.00 |
| Uncompressed RAW (44.4MB) + JPEG Extra Fine (11.1MB) | 133 | 22.10 |
| Compressed RAW (23.1MB) + JPEG Extra Fine (11.1MB) | 288 | 24.56 |
| Lossless Compressed RAW (26.4MB) + JPEG Extra Fine (11.1MB) | 153 | 15.35 |
| HEIF (4:2:0) Extra Fine (4.2 MB) | Never hits buffer | < 2.00 |
| HEIF (4:2:2) Extra Fine (4.9 MB) | Never hits buffer | < 2.00 |
Drive Mode Mid (Max 15fps)
| Image Type | Shots Before Hitting Buffer | Time to Clear Buffer (Seconds) |
|---|---|---|
| Uncompressed RAW (44.4MB) | 177 | 17.68 |
| Compressed RAW (23.1MB) | 918 | 19.41 |
| Lossless Compressed RAW (26.4MB) | 325 | 11.00 |
| JPEG Extra Fine (11.1MB) | Never hits buffer | < 2.00 |
| Uncompressed RAW (44.4MB) + JPEG Extra Fine (11.1MB) | 147 | 22.06 |
| Compressed RAW (23.1MB) + JPEG Extra Fine (11.1MB) | 363 | 24.61 |
| Lossless Compressed RAW (26.4MB) + JPEG Extra Fine (11.1MB) | 185 | 15.28 |
| HEIF (4:2:0) Extra Fine (4.2 MB) | Never hits buffer | < 2.00 |
| HEIF (4:2:2) Extra Fine (4.9 MB) | Never hits buffer | < 2.00 |
Memory Card Readers
If you want to read any of the above cards to your computer then you are also going to need a compatible memory card reader for the card that you are using. Here are a few options:
Sony MRW-G2 CFExpress Type-A Card Reader
The Sony MRW-G2 supports both CFexpress Type A cards as well as a SD/SDHC/SDXC cards, along with transfer speeds of up to 10 Gb/s via USB 3.1 Gen 2. Both USB Type-C to Type-C and USB Type-C to Type-A cables are included.
ProGrade Digital CFexpress Type A & UHS-II SDXC Dual-Slot USB 3.2 Gen 2 Card Reader
The ProGrade Digital reader is a little cheaper than the Sony MRW-G2 but has basically the same specs. It has one CFexpress Type A slot and one UHS-II SDXC slot, and also support up to 10 Gb/s via USB 3.2 Gen 2 to deliver transfer speeds of up to 1.25 GB/s, or 1250 MB/s via its USB Type-C interface. It includes USB Type-C to Type-C and Type-C to Type-A cables.
Sony MRW-S1 UHS-II USB Memory Card Reader/Writer
If you don’t plan on using CFexpress Type A cards then you can save a lot of money by purchasing Sony’s MRW-S1 UHS-II USB SD Card Reader/Writer instead. It can read/write to UHS-II SD Cards via a USB 3.1 interface and is backward compatible with UHS-I SD cards. The MRW-S1 together with Sony SF-G cards can transfer files to and from your computer around 2.6x faster than UHS-I SD cards.
Memory Cards for Recording Video
The Sony a1 supports both 4k and 8k video recording. However, even when shooting in XAVC HS 8K 400Mbps you’ll only need a v60 rated SD card or faster. For XAVC S-I 4K you will need a V90 rated card or faster.
Sony a1 movie recording formats and compatible memory cards are shown in the table below.
| File Format | Maximum Recordable Bit Rate | Supported Memory Card |
|---|---|---|
| XAVC HS 8K | 400Mbps | CFexpress Type A memory card (VPG200 or higher) SDXC V60 or higher |
| XAVC HS 4K | 280Mbps | CFexpress Type A memory card (VPG200 or higher) SDXC V60 or higher |
| XAVC S 4K | 280Mbps | CFexpress Type A memory card (VPG200 or higher) SDXC V60 or higher |
| XAVC S HD | 100Mbps | CFexpress Type A memory card SDHC/SDXC card (U3 or higher) |
| XAVC S-I 4K | 600Mbps | CFexpress Type A memory card (VPG200 or higher) SDXC V90 or higher |
| XAVC S-I HD | 222Mbps | CFexpress Type A memory card (VPG200 or higher) SDXC V90 or higher |
When I receive my own a1 I’ll be testing many of the cards included in this guide with various video settings to verify that they do indeed work with the Sony a1, as it’s not always the case despite what they might say on the label.
Memory Cards for S&Q Motion Shooting
For most S&Q settings you will be able to use a V60 or V90 rated memory card. You will only need to use a CFexpress Type A card (VPG 200 or higher) when recording in XAVC S-I 4K format and 1200Mbps, or XAVC S-I HD and 890Mbps with 240fps/200fps.
Slow-motion and quick-motion movie shooting are not available with [XAVC HS 8K].
Sony a1 S&Q formats and compatible memory cards are shown in the table below.
| File Format | Maximum Recordable Bit Rate | Supported Memory Card |
|---|---|---|
| XAVC HS 4K | 500Mbps | CFexpress Type A memory card (VPG200 or higher) SDXC V60 or higher*1 |
| XAVC S 4K | 560Mbps | CFexpress Type A memory card (VPG200 or higher) SDXC V60 or higher*1 |
| XAVC S HD | 500Mbps | CFexpress Type A memory card (VPG200 or higher) SDXC V60 or higher*2 |
| XAVC S-I 4K | 1200Mbps | CFexpress Type A memory card (VPG200 or higher) SDXC V90 or higher*3 |
| XAVC S-I HD | 890Mbps | CFexpress Type A memory card (VPG200 or higher) SDXC V90 or higher*4 |
*1When [S&Q Frame Rate] is set to [120fps]/[100fps], you may need an SDXC V90 memory card.
*2When [S&Q Frame Rate] is set to [240fps]/[200fps], you may need an SDXC V90 memory card.
*3For slow-motion recording, a CFexpress Type A memory card (VPG200 or higher) is required.
*4When [S&Q Frame Rate] is set to [240fps]/[200fps], a CFexpress Type A memory card (VPG200 or higher) is required.
What Size Memory Card Do You Need?
If you will be shooting a lot of continuous bursts then you will probably want to use at least a 128GB UHS-II card. For CFexpress you can only choose between 80GB and 160GB right now, and they are very expensive.
If you are not shooting long continuous bursts then you’ll probably be fine with 32GB or 64GB cards, and you certainly won’t need the faster CFexpress Type A cards.
For shooting video the size of memory card will depend largely on the format that you are recording in. Or you may be using an external recorder anyway so this won’t be so important.
The following tables will help you to better understand what size cards you need.
How Many Images Can Be Recorded on a Memory Card?
The table below shows the approximate number of images that can be recorded on a memory card formatted in-camera when using a Sony memory card with the aspect ratio set to 3:2 and JPEG/HEIF size set to L:50M.
The values may vary depending on the shooting conditions and the type of memory card used.
| File Format | 64GB SD | 128GB SD | 80GB CF | 160GB CF |
|---|---|---|---|---|
| JPEG Light | 6800 | 13600 | 7900 | 15600 |
| JPEG Standard | 4700 | 9400 | 5400 | 10800 |
| JPEG Fine | 3200 | 6400 | 3700 | 7400 |
| JPEG Extra fine | 1700 | 3400 | 1900 | 4000 |
| HEIF Light | 9100 | 18200 | 10600 | 21200 |
| HEIF Standard | 6800 | 13600 | 7900 | 15600 |
| HEIF Fine | 5100 | 10200 | 5900 | 11800 |
| HEIF Extra fine | 3400 | 6900 | 4000 | 8000 |
| RAW & JPEG (Compressed RAW) | 700 | 1400 | 800 | 1700 |
| RAW & HEIF (Compressed RAW) | 800 | 1600 | 900 | 1800 |
| RAW (Compressed RAW) | 900 | 1900 | 1100 | 2200 |
| RAW & JPEG (Lossless Compressed) | 600 | 1300 | 700 | 1500 |
| RAW & HEIF (Lossless Compressed) | 700 | 1400 | 800 | 1600 |
| RAW (Lossless Compressed) | 800 | 1600 | 900 | 1900 |
| RAW & JPEG (Uncompressed RAW) | 400 | 800 | 500 | 1000 |
| RAW & HEIF (Uncompressed RAW) | 400 | 900 | 500 | 1000 |
| RAW (Uncompressed RAW) | 500 | 1000 | 600 | 1200 |
Movie Record Times
The table below shows the approximate total recording times using a Sony memory card formatted in the Sony a1. The values may vary depending on the shooting conditions and the type of memory card used.
| File Format | Rec Frame Rate | Record Setting | 64GB SD | 128GB SD | 80GB CF | 160GB CF |
|---|---|---|---|---|---|---|
| XAVC HS 8K | 30p/25p | 400M | 15 min | 35 min | 20 min | 40 min |
| XAVC HS 8K | 30p/25p | 200M | 35 min | 70 min | 40 min | 1 h 25 min |
| XAVC HS 4K | 60p/50p | 200M | 35 min | 70 min | 40 min | 1 h 25 min |
| XAVC HS 4K | 60p/50p | 150M | 45 min | 1 h 35 min | 55 min | 1 h 50 min |
| XAVC HS 4K | 60p/50p | 100M | 1 h 10 min | 2 h 20 min | 1 h 20 min | 2 h 50 min |
| XAVC HS 4K | 60p/50p | 75M | 1 h 30 min | 3 h | 1 h 40 min | 3 h 40 min |
| XAVC HS 4K | 60p/50p | 45M | 2 h 20 min | 4 h 50 min | 2 h 40 min | 5 h 40 min |
| XAVC S 4K | 60p/50p | 200M | 35 min | 1 h 10 min | 40 min | 1 h 25 min |
| XAVC S 4K | 60p/50p | 150M | 45 min | 1 h 35 min | 55 min | 1 h 50 min |
| XAVC S HD | 60p/50p | 50M | 2 h 10 min | 4 h 30 min | 2 h 30 min | 5 h 10 min |
| XAVC S HD | 60p/50p | 25M | 3 h 50 min | 8 h 10 min | 6 h 30 min | 9 h 10 min |
| XAVC S-I 4K | 60p/50p | 600M/500M | 10 min | 25 min | 10 min | 25 min |
| XAVC S-I HD | 60p/50p | 222M/185M | 30 min | 1 h 5 min | 35 min | 1 h 15 min |
Simultaneous Recording Slot 1 + Slot 2
If you shoot simultaneously to both memory card slots then I recommend using either two CFexpress cards or two UHS-II cards. If you use a CFexpress card in slot 1 and a UHS-II card in slot 2 then the write speed will be limited by the slower UHS-II card.
Summary
If you shoot a lot of continuous bursts and want the fastest buffer clearing times then you’ll want to go with a CFexpress Type-A card. If you shoot compressed RAW you’ll hit the buffer after around 152 shots which will clear the buffer in around 10 seconds.
If you use a fast UHS-II card like the Kingston Canvas React Plus (my recommended card) then you’ll shoot around 150 shots and clear the buffer in around 26 seconds.
Currently only Sony and Prograde make CFexpress Type A cards. Both cards performed pretty much the same in my tests, but you can often find the Prograde cards for a little less money than the Sony cards. So if you don’t need the added toughness of the Sony cards I’d recommend going with Prograde.
If you shoot simultaneously to both memory card slots then I recommend using either two CFexpress cards or two UHS-II cards. If you use a CFexpress card in slot 1 and a UHS-II card in slot 2 then you will be limited by the slower UHS-II card.
For video shooters you’ll only need to use a CFexpress card when shooting in S&Q mode and recording in XAVC S-I 4K format and 1200Mbps, or XAVC S-I HD and 890Mbps with 240fps/200fps. For all other modes a V90 UHS-II card will be sufficient.
FAQs
The Sony a1 supports CFexpress Type A memory cards in both slots. UHS-I and UHS-II SD cards are also supported in both card slots.
Because currently Sony is the only company making them, there is no competition so they can charge what they like, and they are doing exactly this. Hopefully this will be a different story sooner rather than later as other companies also start producing these cards.
Check Price & Buyer Reviews for Sony A1
At: Amazon | B&H Photo | Adorama | Focus Camera | Wex Photo UK
Sony a1 Resources
Sony a1 Forum & Facebook Group
If you are looking for further help and advice on the a1 or would simply like to share your photos and videos, then please head over to our new Sony A1 Forum. If you prefer Facebook then I also run the Sony A1 Shooters Group.
Nice review! Look forward to seeing the real on camera test for a7r4/a7r4a as well. The real tests tells more than specifications.
I can’t use two SD cards of 256 gb at the same time ?!
When I format a 160GB CFexpress Sony card, and I’m recording lossless compressed RAW to it, the A1 reports it as having space for over 2200 images, rather than 1900. I know that’s an estimate, but I have fitted more than that onto a card.
Hey Tony. I grabbed those figures from Sony’s manual so it is possible that they might be slightly off. I’ll have to remember to check next time I have the a1 in my hands, unfortunately it was just a hire for Christmas and has gone back now. Bit of a relief actually as I don’t need to worry about breaking it!!
Tim, this website is a great find and valuable resource for me. When testing the various cards on the A1, did you record the number of images to fill the buffer, and time to clear the buffer, as you did for the A7iv? I found this extremely useful.
Also, did you look at equivalent data when shooting raw files in APSC mode? I know that this might seem a waste of a 50MP sensor, but under certain circumstances, shooting long bursts without filling the buffer just might make the difference.
Many thanks
David
Thanks for your comment David and I’m glad to hear that you like the website. I’ve not yet tested all of my cards in the A1 like I have with the A7 IV because I don’t own the A1 and it has been difficult to rent here. That said, I hope to be able to rent one in January and will then be testing all of my cards similar to what I’ve done with the A7 IV. I might take a look at the APS-C mode too as I know some people are using this. Have a great Christmas!
Tim, just received my A1 today (from Panamoz) and just working my way through the menus.
If the memory card testing doesn’t require any specialist equipment, I could conduct a few tests for the benefit of the website; please let me know if that would be any help to you.
David
That’s a very nice Christmas present David, just in time too! Thank you very much for your kind offer to help, but I should be ok as all being well I’ll be collecting the A1 on Friday for a 12 day hire, there was a 12 day for the price of 2 offer on over Christmas. No specialist equipment is needed though, just a lot of memory cards! Have a great Christmas and enjoy your new A1! 🙂
Hi David. I hope you had a nice Christmas! Just to let you know I’ve now added the buffer test results to the article. I’ve also included a couple of tests in APS-C mode as well, but didn’t test every card in APS-C mode because my sanity couldn’t cope with so many tests! I hope that’s helpful.
Unfortunately, this comparison is not up to date anymore.
Sandisk released a UHS-II Card with V90 rating.
It’s hard to find it because it’s not listed on their website.
It’s a updated version of the 300MB/s Card.
Iam using it in my Sony A1 because Sandisk Cards never let me down.
Thanks for informing me about the update to the SanDisk cards Chris, I wasn’t aware of this. I’ll get the article updated. All the best, Tim
please show pics of the back sides of these cards