Key features:

f2.8 Lens Type: Telephoto
Compatible Mountings Canon EF
Camera Lens Description 100 millimetres
About this item: 100mm macro USM lens with f/2.8 maximum aperture for Canon SLR cameras
Focal length: 100mm, Closest focusing distance : 1 foot (film plane to subject)
Secondary diaphragm blocks stray light at f/2.8 for increased contrast, Ultra-sonic monitor provides outstanding autofocusing speed at all distances
3-group floating system for exceptional close-up performance; full-time manual focus
Measures 3.1 inches in diameter and 4.7 inches long; weighs 21.1 ounces; 1-year warranty
Optional tripod collar
Lens not zoomable