Dynamic Range -- what it is, what it's good for, and how much you 'need'

Started Oct 17, 2011 | Discussions thread
Steen Bay
Veteran MemberPosts: 6,188
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Re: Absolutely -- noise floor and saturation limit define DR
In reply to Great Bustard, Oct 18, 2011

Great Bustard wrote:

All measures of DR have a noise floor, since the DR is defined as the number of stops from the noise floor to the saturation point. It's just how you define the noise floor.

In most cases, the stated DR is at the pixel level ("screen" on DxOMark) rather than the image level ("print" on DxOMark). The noise floor can be taken as the read noise or the 100% NSR (DxOMark, and I, use the latter). However, the difference between the read noise or 100% NSR in the DR measurement is inconsequential until the read noise gets very low (1-2 electrons), and no DSLR sensors are there yet.

Well, both the 60D and the 1D4 have 1.5 e- read noise at (very) high ISOs, but you're right that it only makes a relatively small difference.

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