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View Full Version : Relationship between magnification and image circle


wsit
16-Apr-2021, 20:10
It is well known that image circle is larger when a lens is used at high magnification. However, I have failed to find a Mathematical formula from any reputable source. My rusty geometry suggests that the

IC at M times mag = IC at infinity * (1+M)

Is that correct?
Dan Fromm
17-Apr-2021, 05:59
Yes. See post #3 in this https://www.largeformatphotography.info/forum/showthread.php?67361-Calculating-lens-coverage discussion.
wsit
17-Apr-2021, 08:01
Very cool! Thanks for the reference!