CANON 28 mm f/1.8 Wide Angle Lens for EF/EF-S
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.