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Darker area in all (very)underexposed pictures

Started Aug 18, 2020 | Questions thread
OP Stefano A New Member • Posts: 6
Re: Darker area in all (very)underexposed pictures

I used dark frames and the light frames(the images).

I noted that the darker area appears in dark frames with a combination of a high ISO and high shutter times. For example for 30s of exposure the darker area is visible for ISO over 1600. Per 1s exposure the problem is not present. The irony is that in the darker zone seems that there's less noise.

1 dark frame, shutter time 30s, ISO 3200, (Sligtly increased brightness with GIMP)

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