SkippyW Offline Upload & Sell: Off
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A couple of factors in play here...
First of all, exposure. If a shot is the least bit underexposed and you have to bring it up, you will see the noise.
Second is the size of the image. If you need to go big, obviously the higher ISO will show more noise.
Test shots are the best way to determine how high you can go. I have my GH3's and G5's set to 3200 max. Beyond that they're not too usable unless I need something small.
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