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The Canon EF 400mm F2.8L IS II USM is an updated version of an earlier design, and is designed for use with Canon's full-frame and APS-C DSLRs. Featuring a completely new optical design and lighter weight construction employing magnesium alloy and titanium, this weather-sealed lens is built for hard, professional use. Optical highlights include Sub Wavelength Structure coating on lens elements, plus water-repellant Fluorine coatings on the front and rear elements. Also new is an image stabilization mode which activates stabilization only during exposure, and a 'Power Focus' mode for video shooting. The upgrades are rounded off by the addition of repositionable AF stop buttons and a choice of tripod mounts.
| Lens type | Prime lens |
| Focal length | 400 mm |
| Image stab. | Yes |
| Lens mount | Canon EF |
| Max aperture | F2.8 |
| Min aperture | F32.0 |
| Min focus | 2.70 m (106.30″) |
| Max magnification | 0.17 x |
| Weight | 3850 g (8.49 lb) |
| Length | 343 mm (13.50″) |
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