Canon RF 400mm F2.8L IS USM is a super telephoto lens for the company’s full-frame mirrorless system.
The lens has 17 elements in 13 groups, with a super UD and two fluorite elements. Super Spectra and Air Sphere coatings reduce ghost images and glows. The image stabilizer reduces vibrations up to 5.5 stops.
The lens has a minimum focus distance of 2.5 m (8.2 feet) and a magnification of 0.17x. There are three focus limit modes available: full, 2.5-7.5 me 7.5 to infinity. The 400 mm F2.8 supports 52mm drop-in filters and Canon 1.4x and 2x focal multipliers.
As with all L-series targetss, the 400 mm F2.8 is sealed against dust and moisture, and the fluorine coating on the front element repels oil and water.