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For all digital sensors: the higher the ISO, the less dynamic range you have to work with. Noise is the result of expecting DR to stay constant... It doesn't.any using iso 2500 with the M9 and getting good results?
in general as you bump the iso besides noise is anything else in image quality compromised like contrast color etc...
thanks for the help
From your article: "... even at f/1, it's still only a stop faster than an f/1.4 lens (admittedly, this means four times as much light). "ISO 2,500 works just fine for me.
Check out an article I wrote, "Shooting In the Dark" and check out some photos from a recent event, where I used high ISO quite a bit (including a bunch at 2,500).