I finally 'get' equivalence

Started May 22, 2012 | Discussions thread
bobn2 Forum Pro • Posts: 54,906
Re: I finally 'get' equivalence

Lights wrote:

bobn2 wrote:

Mr Lumière wrote:

Yes I know, I said that, and that is the same as saying pixel pitch affect DR and noise not sensor size.

Same amount of pixel and larger sensor = better DR and noise

Actually that is not in general true. making the pixels bigger and keeping the same number generally does not affect DR.

4x more pixels and 4x larger sensor = same amount of DR and noise

That also is wrong. 4x more of the same pixels and 4x larger sensor will increase DR and SNR. That is easy to see in practice, just comparing the Nikon D7000 and D800.

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Is this pretty much because each of those little "buggers" has less to do? 4 of them doing the work that 1 used to? (in attempting to understand?)

That's a pretty good metaphor. Noise is a random variation, so it will tend to average out when you combine pixels, whereas the signal adds.

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