Telephoto lens newly equipped with an Image Stabilizer enabling hand-held
shooting for easier movement. The fluorite element and two UD-glass
elements effectively correct the chromatic aberrations prone to occur with
telephoto lenses. With the EOS-1v and EOS-3, the AF speed becomes the
worldÆs fastest. To reduce the overall weight and enhance portability, the lens
barrel and many other exterior parts use a magnesium-alloy. Also, the
detachable tripod collar revolves smoothly and locks securely.


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 & rugged reliability.


Specifications:

Focal Length & Maximum Aperture: 300mm 1:2.8

Lens Construction: 17 elements in 13 groups

Diagonal Angle of View: 8¦ 15'

Focus Adjustment: Inner focusing system with USM

Closest Focusing Distance: 2.5m / 8.2 ft.

Filter Size: 52mm Drop-in

Max. Diameter x Length, Weight: 5.0" x 9.9", 5.6 lbs. / 128.0 x 252.0mm,
2550g (lens only)


Mfr.# 2531A002