How is f-stop calibrated?

Started Mar 8, 2014 | Questions thread
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jackdan
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How is f-stop calibrated?
Mar 8, 2014

Wiki defines f-stop as "the ratio of the len's focal length to the diameter of the entrance pupil."  Does that mean camera manufacturers calibrate their f-stop numbers by measuring the entrance pupil and not the physical aperature as is commonly thought?

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