Perhaps this has been discussed elsewhere and apologies as this is not the point of the discussion -- but why is the D3 in DX mode a stop off from the D3 in non-DX mode? I would have expected it to be just about crop factor, as it clearly is using the same sensor and even same area of the sensor?
It is interesting that the Nikon's die off below their normal limit (e.g. D3 and D300 at 100 vs. 200), but the EOS's falloff is more gradual down to 50.
Yes, it has been discussed, but it's worth revisiting. I'm defining Photographic Dynamic Range in a way that focuses on the final result as opposed to photosite size or sensor size. All the values are adjusted for a standard Circle Of Confusion (COC), and a fixed Signal to Noise Ratio (SNR) with 20 as the threshold. This is equivalent to comparing 8 inch wide prints at a normal viewing distance. Therefore, since a DX crop requires more enlargement than an FX image to reach 8 inches wide; it suffers in the shadows and has less Photographic Dynamic Range.
It is a characteristic of CMOS circuitry as opposed to CCD, that there is a "fall off" as ISO decreases, whereas CCD is (essentially) linear.
Thanks ... this is very intersting. I shoot both D3 and D300 with pro glass. The studio I have been working in for the last 2 1/2 years is Canon and they continuously talk about Pro's using the Canons. They have paid a little attention lately. The others mostly use 5D's and one shooter both 1D Mark III (not s). How would the 5D's plot out using the same testing methodology?
Hi Bill, I am certain the Studio owner (a strong Canon advocate) won't be the one to take the images required, but I (and he) would have no problem if I took the photos required. Please send me a PM with the instructions/procedures for images needs and where to send them and I will try to accommodate mid to end of next week (based upon current work load).
The directions are on my site under "Collaborations" The direct link for this one is Dynamic Range Collaboration E-mail if you have any questions about the procedure. (I admit that the Canon variation has not been exercised very much.)
Bill P.S. - To cover all bases. PM and e-mail sent too.