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That photo of the Andromeda galaxy got me thinking about noise reduction
I saw a post on another forum where a guy spent 6 hours stacking exposures of Andromeda and his final image still looked grainy. He said he used ISO 6400 on a Canon 6D and I wonder if dropping the ISO and taking more subs would have helped. Has anyone here found a hard limit on ISO where the noise tradeoff isn't worth it for deep sky shots?
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mark_thomas16d ago
Dropped ISO to 800 on my 6D and doubled the subs. Night and day difference. The 6D is a ISO-invariant sensor above 800 so you're just adding read noise going higher. Stacking 80 subs at ISO 800 beats 40 at 6400 every time. Try 30 second subs at f/2.8 or faster with ISO 800 and you'll see the noise drop way off.
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