New answers tagged lens-design
2
I agree with user86418's assessment that Jerry Coffin's answer has this backward, though he in turn seems to have conflated numerical aperture with ƒ/number.
Quoting outdoorphotographer.com
In a variable-aperture zoom ... elements in front of and behind the
diaphragm move (and the diaphragm itself moves), so the entrance pupil
doesn’t vary in ...
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