LensTip.com

Lens review

Canon EF 20 mm f/2.8 USM

12 April 2010
Szymon Starczewski

3. Build quality

The Canon’s EF 2.8/20 mm look is typical and classic for this company’s prime lenses with an USM motor. A solid metal casing sticks out at once; it is ended by a metal bayonet mount on one side and by a slightly convex element which is supposed to offer a 94.5-degree angle of view on the other side.

Canon EF 20 mm f/2.8 USM - Build quality

Canon EF 20 mm f/2.8 USM - Build quality


- - - - - - - - - - - - - - - - - advertisement - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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.

Canon EF 20 mm f/2.8 USM - Build quality


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.