D4 vs 1Dx (Imaging Resource), RAW, ACR, 6400-12800

Started Sep 4, 2012 | Discussions thread
bobn2 Forum Pro • Posts: 58,551
Re: D4 vs 1Dx (Imaging Resource), RAW, ACR, 6400-12800

5tve wrote:

What matters most is the D4 can take the same photo as the IDX at a faster shutter speed ( less camera shake) or if they both use the same aperture & shutter speed the D4 can use a lower ISO which means less noise.

Lower ISO does not mean less noise. So far as teh photon shot noise is concerned, which is the major noise, it is exposure which determines the noise. Hihger exposure - less noise, lower exposure more noise, simple as that. 'ISO' doesn't affect that component of noise at all. The other bit of noise, the read noise (or shadow noise), sometimes gets lower as ISO is raised. There are just one or two cameras (none of them DSLRs) where raising the ISO raises the noise.

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