What is the aperture diameter of a 12-mm-focal-length lens set to f/4.0?

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asked Jan 12, 2019 64.7k views

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Relidon · Answer 1 · 2019-01-17T08:55:02+0000

fn = f/d, where fn = ratio of focal length (f) to aperture diameter (d). In the given scenario, d is given as 4. That is,

Lens have been set at f/4.0 and therefore, d = 4.0 mm.

Therefore, aperture diameter is 4.0 mm.

What is the aperture diameter of a 12-mm-focal-length lens set to f/4.0?

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