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A few different garden birds taken at my father-in-law's and shot with the a7 IV and a mix of the Sony FE 100-400 GM and the Sony 70-200 F2.8 GM II + 2x Tele. I'm working on a comparison of these two lenses at 400mm, can you spot the difference? Without looking at the exif 
Blue tit
Long-tailed-tit
Male chaffinch
Female chaffinch
Dunnock
Nuthatch
Blue tit
- ILCE-7M4
- FE 70-200mm F2.8 GM OSS II + 2X Teleconverter
- 400.0 mm
- ƒ/5.6
- 1/1250 sec
- ISO 800
- ILCE-7M4
- FE 100-400mm F4.5-5.6 GM OSS
- 400.0 mm
- ƒ/6.3
- 1/1250 sec
- ISO 800
- ILCE-7M4
- FE 100-400mm F4.5-5.6 GM OSS
- 400.0 mm
- ƒ/5.6
- 1/1250 sec
- ISO 800
Long-tailed-tit
- ILCE-7M4
- FE 70-200mm F2.8 GM OSS II + 2X Teleconverter
- 400.0 mm
- ƒ/5.6
- 1/1250 sec
- ISO 640
- ILCE-7M4
- FE 100-400mm F4.5-5.6 GM OSS
- 400.0 mm
- ƒ/5.6
- 1/1250 sec
- ISO 640
Male chaffinch
- ILCE-7M4
- FE 70-200mm F2.8 GM OSS II + 2X Teleconverter
- 400.0 mm
- ƒ/5.6
- 1/1250 sec
- ISO 800
Female chaffinch
- ILCE-7M4
- FE 70-200mm F2.8 GM OSS II + 2X Teleconverter
- 400.0 mm
- ƒ/5.6
- 1/1250 sec
- ISO 800
- ILCE-7M4
- FE 100-400mm F4.5-5.6 GM OSS
- 400.0 mm
- ƒ/5.6
- 1/1250 sec
- ISO 640
Dunnock
- ILCE-7M4
- FE 100-400mm F4.5-5.6 GM OSS
- 400.0 mm
- ƒ/5.6
- 1/1250 sec
- ISO 1600
Nuthatch
- ILCE-7M4
- FE 70-200mm F2.8 GM OSS II + 2X Teleconverter
- 400.0 mm
- ƒ/5.6
- 1/1250 sec
- ISO 800