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Native ISO of 5D Mark III

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Warren Eig
Native ISO of 5D Mark III
on May 23, 2013 at 4:23:50 pm

So I've done a bunch of tests under differently lighting conditions, sunlight, shadow-- shadow to sunlight. Day, night. With various ND filters (.03-1.2) and have determined that the native ISO of this camera is ISO 640. Any thoughts, comments?

Warren Eig
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Ryan Holmes
Re: Native ISO of 5D Mark III
on May 23, 2013 at 6:13:26 pm

In my completely unscientific test (and use) of the camera 640 seems plausible. I've had a hard time telling the difference between 320, 640, and 1250. Those seem to be the cleanest signals. I doubt Canon would set the base ISO at 1250 (though the C300 is 850 so.....?) which leaves me leaning towards 320 or 640.

It'd be nice to know. Here's a video that lays out all the ISO's side-by-side for a comparison on the 5D3 -

Ryan Holmes
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