100 millimeter focal length and 1:2.8 maximum aperture. The EF1.4X II; EF2X II extenders cannot be used with this lens. There are no compatible close-up lenses
Lens construction consists of 15 elements in 12 groups
23.4-Degree diagonal angle of view
Inner focusing system with USM and full-time manual focus option. Closest focusing distance 0.99 feet; 0.3 meter (maximum close-up magnification: 1x)