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He calls the f-number the ratio number, aperture ratio number, and ratio aperture.
en.wikipedia.org For example, a camera with a 0.5 mm diameter pinhole, and a 50 mm focal length would have an f-number of 50/0.5, or 100 ("f" /100 in conventional notation).
en.wikipedia.org A smaller maximum aperture (larger minimum f-number) is slow because it delivers less light intensity and requires a slower shutter speed.
en.wikipedia.org The result is that the effective f-number of a zone plate is lower than for the corresponding pinhole and the exposure time can be decreased.
en.wikipedia.org As with other light readings, shutter speed can be changed as long as the f-number is altered to compensate, e.g. second at gives equivalent exposure to second at.
en.wikipedia.org