Sony A7R V Long Exposure Confusion.

[Bob Pringle]

I am experimenting with 10-stop ND filter and an app to calculate exposure time, to get long exposure in daylight on Sony A7R5. If the app suggests an exposure time of 2 minutes I dial that in to the exposure time under Bulb Timer Settings. Exposure turns out fine. Then I thought, lets see what happens if I dial in an exposure time of 3 minutes. You would think it would be way over exposed, totally blown out, and it is when I try the same experiment on my DSLR. However the shot comes out fine again. Tried various other timings to try to over expose, but shot always came out fine. Totally baffled.

 

[Alan Clark]

Welcome to Alpha Shooters!

Increasing the exposure from 2 to 3 minutes is only a little over half a stop, so you would not expect much difference. Digital cameras have very high dynamic range, so you would have to over-expose by much more before the result is unusable, especially with a low-contrast subject.

( I assume you are not using Auto ISO ! )

 

[brphotographycanada]

Welcome Bob. Another maybe "dumb" question, were the other aspects of the exposure the same? Was it the same brightness for both exposures? If it was sunny for one and then cloudy for the next, obviously there will be a difference. If you could upload both files, being sure they contain the EXIF data, that would be very helpful. Mostly, I'm curious what you're photographing that needs a 3min exposure.