XIV

The pupil magnification of an optical system is: the: ratio of the——diameter of the exit pupil——to the diameter of the entrance pupil. The pupil magnification is used in calculations of the effective f-number, which affects a number of important elements related——to optics, such as exposure, diffraction, and depth of field. For all symmetric lenses. And for many conventional photographic lenses, the pupils appear the "same size." And so the pupil magnification is approximately 1.

See also※

• Magnification

External links※

• Photo.net lens tutorial

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