Quote:
Finally be careful with ISO, it is not true that higher ISOs produce more noise it's the opposite. The reason why high ISO images seem to have more noise is because of the shorter exposure times and not because of the ISO itself.
F4 30'' at ISO100 has more noise than F4 30'' at ISO200. Believe me.
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I dunno about that.
The math sounds impressive but I have some landscape photos where the exposure length was about 2 minutes at 100 iso on my 1ds mk3. There is darn near zero noise in them.
If I did 2 minutes at 1600 iso I can't imagine it would have near zero noise in it.
This photo was 106 seconds ;
http://www.gavincato.com.au/Blogging...verseas025.jpg
This photo was 121 seconds ;
http://www.gavincato.com.au/Blogging...verseas027.jpg
The 100% crops which I can post if you like have pretty much zero noise.