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Old 29-08-2011, 11:53 AM
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SkyViking (Rolf)
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Location: Waitakere Ranges, New Zealand
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Quote:
Originally Posted by naskies View Post
I remember reading an article that someone wrote where they systematically tested ISO 100, ISO 200, etc with multiple stacked long exposures on a Canon dSLR. From memory, I think the bottom line was that ISO 800 and ISO 1600 was the best option for them (trading off exposure time versus noise, etc). I can't recall the link, sorry.
I think I read that too somewhere,. It seems to depend a lot on the actual camera/chip. Personally I use a pretty basic Canon S5IS for widefield shots and it's my experience that lower ISO combined with longer exposure gives a lot less noise. My understanding is that ISO for digital cameras is pretty much the gain applied to the signal, so in theory one would be better off with lowest possible ISO. But it's probably best if you take some test shots for your particular camera and then decide.
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