Long Exposures & noise... ISO vs shutter time

Started Feb 20, 2013 | Discussions thread
OP BlueTrain Forum Member • Posts: 59
Re: lowest ISO = least noise

Yes that's as I understand it too, and for my camera (5d mk2) I think it is the case that for ISO 50, which requires enabling one of the custom functions, the camera simply takes an overexposed shot at ISO 100 and then recovers from that image.

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