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#photography

Question

The f-number N is given by:

Answer

F = f / D
where f is the focal length, and D is the diameter of the entrance pupil (effective aperture).

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F-number - Wikipedia, the free encyclopedia
tio in telescopes 6 Working f-number 7 History 7.1 Origins of relative aperture 7.2 Aperture numbering systems 7.3 Typographical standardization 8 See also 9 References 10 External links Notation[edit] The f-number N is given by: <span>where is the focal length, and is the diameter of the entrance pupil (effective aperture). It is customary to write f-numbers preceded by f/, which forms a mathematical expression of the entrance pupil diameter in terms of f and N. [2] For example, if a lens's focal length is

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status	not learned	measured difficulty	37% [default]	last interval [days]
repetition number in this series	0	memorised on		scheduled repetition
scheduled repetition interval		last repetition or drill

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