EXCERPT page containing first few paragraphs. 2021-12-02 17:05:59
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A depth of field table using 33 microns as the circle of confusion is an interesting choice in the era of high resolution digital.
That’s because a Nikon D810 pixel is less than 5 X 5 microns square, making the “acceptably sharp” CoC about 25 times larger in area than a D810 photosite/pixel, e.g. equivalent to ~1.4 megapixels, quite a far cry from 36 megapixels.
- 5 X 5 approximate dimensions of the photosite on 36MP full-frame sensor = 25 square microns with diameter ~7 microns.
- 33 microns is the diameter of a theoretical circle of confusion (CoC) having area of π * (33/2)^2 = 855 square microns.
- Hence relative diameter is 33/7 = 4.7X larger than photosite.
Subtract at least two if not three (3) stops for something sensible and consistent with perceived reality for moderately large prints, e.g., f/11 instead of f/4.
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