- Focal length and maximum aperture: 100mm 1:2.8
- Lens construction: 8 elements in 6 groups
- Diagonal angle of view: 24 Degree
- Rear focusing system with USM focus adjustment
- Closest focusing distance: 0.9m/3 ft.
- EF mount; telephoto lens
- Internal focusing; full-time manual focus
- 100mm focal length
- f/2 maximum aperture
- Micro UltraSonic Motor (USM)
Despite the large maximum aperture, the lens remains compact. Lens group 5 moves for rear focusing, and sharp, crisp pictures are obtained at all apertures. The background blur is ideal for portraits. The USM autofocuses the lens quickly and quietly.