A telephoto lens with focal length of 120mm has f-numbers ranging from f/2.8 to f/22. What...

Question

Question

A telephoto lens with focal length of 120mm has f-numbers ranging from f/2.8 to f/22.

What is the diameter of the lens aperture at f/2.8?

What is the diameter of the lens aperture at f/22?

Answer 1

Answer #1

f-number = focal length/lens diameter.

so: focal length/f--number = lens diameter

(120 mm)/2.8 = 42.86 mm

(150 mm)/22 = 5.45mm

Answer 2

Answer #2

f-number = focal length/lens diameter.

so: focal length/f--number = lens diameter

(120 mm)/2.8 = 42.85 mm

(120 mm)/22 =5.454 mm

Answer 3

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