1:1 life-size magnification
3-group floating system
Ring-type USM (Ultra-Sonic Motor) focusing
Full-time manual override (FTM)
12 lens elements arranged in 8 groups
EF 100mm f/2.8 Macro USM
The EF 100mm f/2.8 Macro USM offers a 1:1 magnification (life-size reproduction) for macro photography. It has a focal length of 100mm and a long working distance that offers a greater convenience for close-up shots. The floating focusing mechanism and the ring-type USM (Ultra-sonic Motor) accentuates the experience of using this lens.
Autofocus lens for macro photography up to life-size (1x) magnification. Inner focusing affords a long working distance of 5.9in. (149mm) at 1x. A 3-group floating system results in excellent delineation at all focusing distances. Ring USM for silent and high-speed AF, and full-time manual focusing also provided.
Focal Length & Maximum Aperture
12 elements in 8 groups
Diagonal Angle of View
Inner focusing system with USM
Closest Focusing Distance
0.31m / 1 ft. (film plane to subject)
Max. Diameter x Length, Weight
3.1" x 4.7", 21.1 oz. / 79.0 x 119.0mm, 600g