Combine a fast f/1.8 aperture with 28mm wide-angle focal length, and add Canon’s Ultrasonic Motor AF.
The result is this surprisingly affordable fixed focal length alternative to wide-angle zooms that’s ideal for low-light shooting. Internal, rear-group focusing means the front element never moves, so it’s easy to use with filters and accessories.
The autofocus is virtually silent, and full-time manual focus is always available.

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: