Canon EF 20 mm f/2.8 USM
3. Build quality
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Inside the lens we’ll find 11 elements in 9 groups and an aperture with five diaphragm blades, which can be stopped down to f/22.
The autofocus mechanism, based on an USM motor, moves elements inside the casing so the lens is weather-sealed and can cooperate with different filters without any problems; in this case the filters should be 72 mm in diameter.