PIX 2015

D600 High ISO in DX

Started Nov 23, 2012 | Questions thread
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Leo360
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Re: Clarkvision.com analysis
In reply to bobn2, Nov 23, 2012

bobn2 wrote:

Leo360 wrote:

bobn2 wrote:

Leo360 wrote:

Leo360 wrote:

So far from what I saw on Bill Claff's charts is that D600(DX mode) dynamic range outperforms D7000 at all ISOs. I have no reason to think that with D5200 it will be any different.

Leo

For those interested in the subject of sensor performance with all the gory details, please, read the sensor section at the clarkvision.com. Highly recommended read!

Only highly recommended if you want to end up getting all kinds of stuff wrong. Which seems to be what you have done. Particularly, the section on the effects pixel size is extremely confused.

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Bob

And how exactly it is confused?

Where to start? I've done this so many times. If I was sensible I would just keep a bookmark, but I'm not that organised. OK, going from the top:

Dynamic range is defined in this document and elsewhere on this site as:

  • Dynamic Range = Full Well Capacity (electrons) / Read Noise (electrons)

Moreover, Roger predicts that 5um is the optimum pixel pitch for any CMOS sensor. Bob, what is your take on it?

The overall pint is this,Roger (and you) is obsessed with comparing things at the pixel sampling frequency, which means making comparisons over different bandwidths. That produces nonsense results, particularly nonsense if what you are interested in is, if you take like photos from the two cameras being compared, which looks better.

I cannot speak for Roger but I am NOT comparing across pixel sampling frequencies. On the contrary, I am re-sampling the higher freq. image (think down-sampling) to a common sampling rate and then comparing at the same reference frequency. And  down-sampling (when performed properly) tends to improve SNR.

Leo

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