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A7Siii Second Base ISO is 10000 and not 12800 for Slog3


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Hi guys,

I have found this weird difference between what I see in my A7SIII and what I've heard online and on YT, in that my second base ISO seems to be 10000 ISO and not 12800 for Slog 3. I found this out by increasing the ISO in low light to reach that magical 12800 where the noise clears up brilliantly, except mine is one ISO stop earlier from what everyone else seems to be getting.

Has anyone heard of this before? I am not sure if I should be concerned or not as everything else in the camera otherwise works perfectly however, this is bugging me a little. Another question is, does this mean that my first base ISO is also one ISO lower than the base 640 for Slog3?

I have noticed the same thing for pretty much every other gamma as well, also tried switching PAL to NTSC with the same result.

I'm currently running firmware 1.01.


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  • 3 weeks later...
  • 4 months later...

I know this post is a bit old, but I wanted to say I experienced the same thing. I had my old Sigma 30mm f/1.4 aps-c lens on, without aps-c mode enabled on the camera, at f/1.4 the circuit triggers at 10000. Otherwise it is 12800. Seems like a bug with some lenses.

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