http://www.usa.canon.com/cusa/sna/professional/lenses/ef_lenses/ef_500mm_f_4l_is_usm?pageKeyCode=writeReviewPage
EF 500mm f/4L IS USM
7318
Specifications
Main Unit Spec
| Focal Length & Maximum Aperture | 500mm 1:4.0 |
| Lens Construction | 17 elements in 13 groups |
| Diagonal Angle of View | 5° |
| Focus Adjustment | Inner focusing system with USM |
| Closest Focusing Distance | 4.5m / 14.8 ft. |
| Filter Size | 52mm Drop-In |
| Max. Diameter x Length, Weight | 5.8" x 15.2", 8.5 lbs. / 146.0 x 387.0mm, 3870g |