Helpful Posts: F-number must be calculated given the diameter of the lens element immediately in front of an aperture and the size of the opening in the aperture correct?
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Thread: Yet another aperture question
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18th July 2017, 08:45 PM #1
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Yet another aperture question
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18th July 2017, 08:52 PM #2
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Re: Yet another aperture question
Focal length / diameter aperture.
Originally Posted by Abitconfused
George
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18th July 2017, 09:12 PM #3Moderator
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Re: Yet another aperture question
Technically the focal length / diameter of the entrance pupil. It has nothing to do with the diameter of the lens element.
https://en.wikipedia.org/wiki/Entrance_pupil
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