EXCERPT page containing first few paragraphs. 2023-03-21 16:13:07
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Depth of Field Table for Zeiss ZM 35/1.4 Distagon
A depth of field table using 33 microns as the circle of confusion is a debatable choice in the era of high resolution digital. Sometimes conventions should be dropped, changed: as of 2014 hardly anyone shoots film and 33 microns is a huge blur circle visible even in a modest size print as not sharp.
A pixel on a 36-megapixel full frame sensor is less than 5 X 5 microns square, making the “acceptably sharp” CoC about 25 times larger in area than the photosite/pixel, e.g. equivalent to ~1.4 megapixels, quite a far cry from 36 megapixels. The equation is only slightly better for a 24 megapixel sensor.
- 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.
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Diglloyd Guide to LEICA contains in-depth coverage of Leica M system cameras and lenses, with additional coverage of Leica M Monochrom, Leica Q.
Special emphasis is placed on Leica M lenses and certain Zeiss ZM lenses.
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- Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.
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