EF mount; telephoto lens Internal focusing; full-time manual focus 100mm focal length f/2 maximum aperture Micro UltraSonic Motor (USM)
Focal length and maximum aperture: 100mm 1:2
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.