I have a D3s with no infrared filter (it has been removed). When I take dark images in high ISO with body cap on and covered in a wrap (so no light gets in), and no lens mounted, the images are not dark but surprisingly bright.
Is it because of internal heat and/or infrared radiation? Can I do something about it?
Here's an image with IR filter on and same conditions (ISO:51200, Expo. time 1/400 s)
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