Optics
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 ƒ2.8L 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 197mm)
AF limiter switch 1) 3.5m (11.5 feet) to infinity; 2) 2.8m (9.2 feet) to infinity
Diaphragm
Aperture range ƒ4 ~ ƒ32, 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 ƒ2.8L IS, etc.)
Weather Resistance
Weather-resistant construction • Rubber ring at lens mount (similar to EF 300 ƒ2.8L I.S., etc.)
• Switch panel is gasketed
• Manual focus and “playback” rings feature special 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 ƒ2.8L IS lens)
Lens case Exclusive polyethelene trunk case
Tripod mount Removable (same as EF 300 ƒ2.8L 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 12–0.16x; EF 25–0.20x)
500D close-up lens Not compatible (will not fit)
Dimensions & Weight
Dimensions; length x ø 9.4 x 5.0 inches (232.7 x 128mm)
Weight 4.3 lbs. (1940g)
Canon Lens
New Product Specifications
EF 400 ƒ4.0 DO IS USM
