Canon EF 400 User Manual

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

Canon EF 400 Specifications

General

Brand	Canon
Model	EF 400
Category	Camera Lens
Language	English

Summary

Optics

Optical construction

Specifies the number of lens elements and groups within the optical design.

Fluorite elements

Indicates the presence and count of Fluorite lens elements.

Diffractive Optics elements

Details the number of Diffractive Optics (DO) elements used.

Multi-coating

Notes the application of Super Spectra coating on all lens elements.

Image Stabilization optics

Describes the optical components related to the Image Stabilization system.

Autofocus

AF motor

Specifies the type of autofocus motor used in the lens.

AF speed

Relates AF speed to other comparable super telephoto lenses.

Manual focus

Describes the manual focus capability, including full-time manual focus.

Minimum focus distance

States the closest distance at which the lens can achieve focus.

Maximum magnification

Provides the maximum magnification ratio and its effect on framing.

AF limiter switch

Details the available AF limiter switch positions and their ranges.

Diaphragm

Aperture range

Specifies the settable aperture range and step increments.

Number of diaphragm blades

Indicates the number of blades used in the lens diaphragm.

Image Stabilization

Stabilizer operation

Explains how the image stabilizer is activated.

Stabilizer effectiveness

Quantifies the effectiveness of the image stabilization system.

Stabilizer modes

Describes the different Image Stabilization modes available.

Tripod operation

Details the automatic behavior of Image Stabilization when mounted on a tripod.

Weather Resistance

Weather-resistant construction

Outlines the features that contribute to the lens's weather-resistant design.

Accessories

Filter size

Specifies the filter size and type for rear drop-in filters.

Lens Hood

Identifies the compatible lens hood model.

Lens case

Describes the type of lens case included with the lens.

Tripod mount

Notes the removability of the tripod mount.

Tele Extender compatibility

Details compatibility with Canon EF tele extenders.

Extension Tubes EF 12, EF 25 500D close-up lens

Lists compatibility with specific extension tubes and close-up lenses.

Dimensions & Weight

Dimensions; length x ø

Provides the physical dimensions of the lens in inches and millimeters.

Weight

States the weight of the lens in pounds and grams.