The most affordable fixed focal length wide-angle lens in the Canon EF line-up continues to give benefits difficult or impossible to find with zooms. The fast f/2.8 aperture makes it easy to use in low light, and provides a bright viewfinder image in the camera. It focuses as close as 10 inches (0.25m) without accessories. And optically, it provides excellent edge-to-edge contrast and sharpness along with superior correction of linear distortion, so straight lines in a subject (such as architecture) remain straight.

Weight (g):	310
Filter Diameter (mm):	58
Maximum Magnification (x):	0.18
Magnification with Extension Tube EF12:	0.61-0.43
Magnification with Extension Tube EF25:	1.13-0.96
Diagonal Angle of View:	75°
Horizontal angle of view:	65°
Lens Construction (elements/groups):	10/9
Max. Diameter x Length (mm):	73.6x55.6
Minimum Aperture:	22
No. of Diaphragm blades:	7
Closest Focusing Distance (m):	0.25
AF Actuator:	USM (Mechanical full-time manual focusing built-in.)
Soft Case:	ES-C9
Hard Case:	LHP-C10
Lens Hood:	EW-63
ir:	ir
ultrasonic:	ultrasonic
al_1:	al_1
ftm:	ftm
All data based on Canon's Standard Test Method:
Subject to change without notice: