Canon 5D, 5D2, 7D vs Pentax K5 noise and DR comparision

Started Nov 30, 2010 | Discussions thread
OP _GUI_ Regular Member • Posts: 386
Re: Canon 5D, 5D2, 7D vs Pentax K5 noise and DR comparision

Philip Goh wrote:

These are the sat points I used for the test:

CAMERA ISO100/80 ISO1600
5D: 3692 3692
5D2: 15758 15763
7D: 13582 15299
K5: 16383 16383

I'm sorry but I still do not understand this.

If the saturation points you've used in the test are different, does that make the test invalid? Additionally, my understanding would be that the saturation point corresponds to the point where highlight clipping occurs. Surely you'd want this point to be the same for all cameras?

What does the length of the SNR curve mean? I interpreted that as having a wider dynamic range. Is that incorrect?

The saturation point is an inherent parameter of each camera sensor. It's the RAW value in which clipped highlights are encoded in each camera.

I calculate and adjust this sat point to correspond with the 0EV reference of the plots.

The length of the curve means nothing; there is curve at those EV values for which I measured RAW data to plot the curves.


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