EXCERPT page containing first few paragraphs. 2019-05-20 18:44:27
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The table below is courtesy of Carl Zeiss, Inc.
The “Chief Ray Angle” column shows object side and image side. The image side is what we’re concerned with for vignetting and color shading (the first number is half the diagonal field angle, and it has nothing to do with the vignetting, off-center color shift, etc).
As can be seen, the Zeiss ZM 21mm f/4.5 Biogon has a chief ray angle of 44.4°, which is extreme. The next most troublesome lens would be the ZM 18mm f/4 Biogon.
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