The Canon EF 400mm F5.6L USM is a telephoto prime lens for Canon's full-frame and APS-C DSLRs, designed with portability and handling ease in mind. Trading brightness for size (and cost) the 400mm F5.6L's optical construction is relatively simple, comprising seven elements in six groups, but contains one Super UD element, whose characteristics are similar to fluorite, and one UD element. Optically, this lens is outstanding, but its slow maximum aperture and lack of image stabilization could limiting factors in some situations. The lens is equipped with a built-in hood and a detachable tripod mount.
| Principal specifications | |
|---|---|
| Lens type | Prime lens |
| Max Format size | 35mm FF |
| Focal length | 400 mm |
| Image stabilization | No |
| Lens mount | Canon EF |
| Aperture | |
| Maximum aperture | F5.6 |
| Minimum aperture | F32 |
| Aperture ring | No |
| Number of diaphragm blades | 8 |
| Optics | |
| Elements | 7 |
| Groups | 6 |
| Special elements / coatings | 1 UD-glass element |
| Focus | |
| Minimum focus | 3.50 m (137.8″) |
| Maximum magnification | 0.12× |
| Autofocus | Yes |
| Motor type | Ultrasonic |
| Full time manual | Yes |
| Focus method | Internal |
| Distance scale | Yes |
| DoF scale | Yes |
| Physical | |
| Weight | 1250 g (2.76 lb) |
| Diameter | 90 mm (3.54″) |
| Length | 257 mm (10.1″) |
| Materials | Metal barrel, metal mount |
| Colour | Grey and Black |
| Filter thread | 77 mm |
| Hood supplied | Yes |
| Hood product code | built-in retractable hood |
| Tripod collar | Yes |
| Optional accessories | detachable tripod mount Hard Case: LH-D29 Soft Case: LZ1132 |
