more pixels are better!

Started Dec 14, 2008 | Discussions thread
bobn2
bobn2 Forum Pro • Posts: 70,345
Re: SNR vs exposure

ejmartin wrote:

bobn2 wrote:

Graystar wrote:

bobn2 wrote:

That is wrong, there is no evidence supporting the 'DR depends on
pixels size' argument, because it is physically incorrect. What there
is is a lot of anecdotes and poorly framed 'tests'. The physics says
clearly that DR depends on sensor size and efficiency...

Explain why DxO Labs reports that even though the G10 sensor has a
slightly better SNR than the LX3 sensor, the LX3 sensor has one stop
more DR.

Not sure how the question relates at all to what I said, but I'll
answer it anyway. SNR according to DXO, as I understand it, is the
SNR of a 18% grey, exposed as the camera chooses.

Not sure if this is correct. Based on what they are doing, I would
think that it's SNR at 18% of raw saturation. They seem rather
uninterested in how the camera is metering, and instead simply
measuring sensor performance from RAW data.

You are probably right. The reason I said 'as I understand it' is that DxO is very vague on the detail of its test methods, one of the reasons its less useful than it might be.

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Bob

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