http://www.usa.canon.com/cusa/sna/professional/lenses/ef_lenses/ef_600mm_f_4l_is_usm?pageKeyCode=writeReviewPage
EF 600mm f/4L IS USM
7320
Features
-
High-performance L-series super-telephoto lens series with built-in dual-mode Image Stabilizer (IS) function.
-
Ultra-high image quality through new optical designs with Fluorite and UD Glass.
-
World's highest AF speed with improved Ring USM (Ultrasonic Motor) and new algorithms for focus prediction with moving subjects.
-
Magnesium alloy lens barrels for reduced weight and rugged reliability.