BlattWorld, Item Details: Canon EF 100mm f/2.8 Macro USM

Optically, a three-group floating system for exceptional close-up performance.
The first lens in its class to feature innner focusing. The lens length never changes, even at life size!
A secondary diaphragm blocks stray light at f/2.8, increasing contrast when shooting wide-open.
Ultrasonic Motor provides outstanding AF speed at all focusing distances.
Wide manual focusing ring with smooth action, and full-time manual focus even in AF mode.
Focal Length & Maximum Aperture
100mm 1:2.8
Lens Construction
12 elements in 8 groups
Diagonal Angle of View
24°
Focus Adjustment
Inner focusing system with USM
Closest Focusing Distance
0.31m / 1 ft. (film plane to subject)
Filter Size
58mm
Max. Diameter x Length, Weight
3.1 x 4.7, 21.1 oz. / 79.0 x 119.0mm, 600g