Announced Feb 11, 2002 •
3 megapixels | 1.8″ screen | APS-C sensor
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Hopefully, we all know that LO res is obtained by binning pixels on-chip, using Foveon's VPS technology, and that the binning for LO res is 2x2. Thus, for the SD9, we get 1134x756px images from 2268x1512px. So, for the Merrill's 4704x3136px, we would expect 2352x1568px, would we not? Curiously, what we get is 2336x1568px (an aspect ratio of 1.49, not 1.5), see here: http://www.dpreview.com/reviews/sigmasd1/2 Why? Anybody know for sure? --A good post is short on words and long on references....
The question assumes 100% fill factor and round :-O pixels, to keep the question simple. Let's say that, for a particular set-up, a CoC calculation (rightly or wrongly) gives a value of 0.014mm at the sensor but I insist on using 2x2 binning on a Sigma SD9 or SD10 giving an 0.018mm 'diameter' pixel. Would the DOF be that for 0.014mm or that for 0.018mm? Putting that another way, does the sensor pixel density px/mm^2 have an intrinsic DOF when projected out to the subject plane? I'm thinking...