Canon EF 400mm f/4.0 DO IS USM Overview

Announced Sep 6, 2000 •
Telephoto prime lens | Canon EF | 7034A002
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Canon EF 400mm f/4 DO is USM Super Telephoto Lens for Canon SLR Cameras
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Product description
Announced Sep 6, 2000
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The Canon EF 400mm F4.0 DO IS USM was the first Canon lens to offer diffractive optical lens technology, which is designed to give high optical quality in a considerably more compact and lighter package than would be possible using conventional elements. As well as the fancy optics, this lens also features image stabilization for a 2-stop shutter speed advantage, a ring-type ultrasonic focus motor and dust and moisture-sealing. Optically, this innovative lens is bettered by Canon's more conventional telephoto primes, but the 400mm DO's compact dimensions and comparatively light weight make it a good choice for sports and wildlife photography.

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Quick specs
Lens type Prime lens
Focal length 400 mm
Image stab. Yes
Lens mount Canon EF
Max aperture F4
Min aperture F32
Min focus 3.50 m (137.8)
Max magnification 0.12×
Weight 1940 g (4.28 lb)
Length 233 mm (9.16)

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