Answer:
it is measure in f-stops
Aperture, then, is measured in f-stops. This is just the ratio between the focal length, how tall the bucket is, and the aperture. Most lenses you can buy have a range of f-stops between about f/1.8 and f/22. This means the ratio of the focal length (f) to the aperture is between 1.8 and 22.
Explanation:
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