Canon 17-40mm f4.0L USM is an Auto Focus (AF) Wideangle Zoom lens with 35mm FF max sensor coverage and it is designed to be used with Canon EF mount lenses.
Lens Mount
Canon 17-40mm f4.0L USM is compatible with cameras that have Canon EF lens mount.
Sensor Coverage
Max sensor coverage of Canon 17-40mm f4.0L USM is 35mm FF.
Focal Range
Canon 17-40mm f4.0L USM has a focal range of 17-40mm and 2.4X zoom ratio.
Body Colour
Black
Zoom Method
Rotary (internal)
Aperture
Canon 17-40mm f4.0L USM has a constant max aperture of f4 from 17mm all the way to the 40mm .