Questions tagged “entrance pupil”

Ask the Unique Photo creator community — gear, technique, post-processing and more.

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votes

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answers

112

Why can a 400mm f/4 lens have a smaller-looking aperture than 100mm?

lensesaperturef-numberopticsentrance-pupil

Photography Stack Exchange contributor

7y ago

0

votes

2

answers

181

Is entrance pupil diameter the same as the effective aperture used for f-number?

lens-designaperturef-numberopticsentrance-pupil

Photography Stack Exchange contributor

13y ago

0

votes

2

answers

100

Why does a variable-aperture zoom have a larger effective aperture at 200mm than at 18mm?

lens-designaperturef-numberzoom-lensesentrance-pupil

Photography Stack Exchange contributor

15y ago