EXCERPT page containing first few paragraphs. 2022-08-15 23:25:39
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At infinity focus, vignetting is two stops into the extreme corners. Stopping down to f/8 reduces it to about 1/4 stop.
At 1:5 close range focus, the image circle is much larger, and vignetting wide open is about one stop, dropping to negligible levels at f/8.
It is unclear if a reproduction ratio of 1:5 is really f/3.5, or perhaps f/4 or f/4.5.
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