| I own it | I want it | I had it |
| 9 | 6 | 4 |
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.
| Lens type | Prime lens |
| Focal length | 400 mm |
| Image stab. | Yes |
| Lens mount | Canon EF |
| Max aperture | F4.0 |
| Min aperture | F32.0 |
| Min focus | 3.50 m (137.80″) |
| Max magnification | 0.12 x |
| Weight | 1940 g (4.28 lb) |
| Length | 233 mm (9.16″) |
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 | 24.1 megapixels 3″ screen APS-C sensor |
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