Traditional Culture Encyclopedia - Photography major - What lens does the photographer mean by' 220 lens'

What lens does the photographer mean by' 220 lens'

220, also called air cutting machine, is a top fixed-focus lens.

Nikon 220 (AF-S VR 200F/2IF-ED)

Canon EF 200/2L is USM.

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220 means: the first 2 is the focal length of 200, and the second 2 is the constant aperture of 2.0.

Other similar names are 640,328 and so on.