There have been a discussion on another list about what the "f" in the aperture value means, like when one say "f2.8" or such.
Different theories have been put forward. Anyone here who has an authoritive answer?
Correctly written, its F/2.8 or F:2.8. where F = focal length.
At F/2.8, the lens has an aperture that is 1/2.8th of the focal length. So a 28mm at F/2.8 lens would have a 10mm aperture (28/2.8)
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