A telephoto lens with focal length of 120 m m has f -numbers ranging from f /2.8

Question

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

Part A What is the diameter of the lens aperture at f/2.8? in millimeters

Part B What is the diameter of the lens aperture at f/22?
A telephoto lens with focal length of 120mm  has f-numbers ranging from f/2.8 to f/22.

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

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

Part A What is the diameter of the lens aperture at f/2.8? in millimeters

Part A What is the diameter of the lens aperture at f/2.8? in millimeters

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

Explanation / Answer

Part A- aperture diameter = f/2.8 = 120/2.8 = 42.85mm

Part B - aperture diameter = f/22 = 120/22 =5.45mm

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