Optical construction: 17 elements, in 13 groups
Fluorite elements: One (8th element)
Diffractive Optics elements: Two (2nd and 3rd elements)
Multi-coating: Super Spectra coating used on all elements
Image Stabilization optics: Three element group toward rear of lens (elements 11-13)
AUTOFOCUS
AF motor: Ring-type Ultrasonic Motor
AF Speed: Equivalent to new I.S. super telephotos (EF 300 f2.8L IS, etc.)
Manual Focus:Mechanical full-time Manual focus, even with lens in AF mode, on any EOS camera
Minimum focus distance:11.5 feet (3.5m)
Maximum magnification: 0.12x; fills the frame with a subject 11.6 x 7.7 inches (296 x 197)
AF limiter switch: 1) 3.5 (11.5 feet) to infinity; 2) 8m (26.2 feet) to infinity
DIAPHRAGM
Aperture range: f4-f32, settable in 1/3, 1/2, or full steps, depending upon camera body used
Number of diaphragm blades: Eight
IMAGE STABILIZATION
Stabilizer operation
: Activated by pressing shutter button half-way
Stabilizer effectiveness: Up to two stops
Stabilizer modes:
*Mode 1: General hand-held shake prevention
* Mode 2: Correction for deliberate panning with a moving subject
Tripod operation: Lens automatically switches Image Stabilization control within 1 second if solid mounting is detected (similar to EF 300 f2.8L IS, etc.)
WEATHER RESISTANCE
Weather-resistant construction: *Rubber ring at lens mount (similar to EF 300 f2.8L I.S., etc.)
* Switch panel is gasketed
* Manual focus and "playback" rings feature over-lapping weather-resistant design
ACCESSORIES
Filter size: 52mm rear drop-in (gelatin filter holder included; screw-in and dedicated Polarizer available)
Lens Hood: ET-120 carbon-fiber (same as Ef 300 f2.8L IS lens)
Lens case: Exclusive polythelene trunk case
Tripod mount: Removable (same as EF 300 f2.8L IS lens)
Tele Extender compatibility: Fully compatible with all Canon EF tele extenders
* EF 1.4x / 1.4x II: full AF with any EOS body
* EF 2x / 2x II: AF possible at center focus point only with EOS-1v and EOS-3 bodies
Extension Tubes EF 12, EF 25: Fully compatible (max. magnification: EF 12-0.6x; EF 25-0.20x)
500D close-up lens: Not compatible (will not fit)
DIMENSIONS & WEIGHT
Dimensions; Length x 0: 9.2 x 5.0 inches (232.7 x 128mm)
Weight:4.3 lbs. (1940g)
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