Released in 2001, the EF400mm F4 DO IS USM was the world’s first super telephoto lens incorporating the exclusive Canon-developed multi-layer diffractive optical element for camera lenses. The optical element, which incorporates light diffraction, was a major technological breakthrough, and it features an exceeding ability to correct chromatic and spherical aberrations and render high-quality images. By including this optical element in the lens design, the lens achieved tremendous savings of 26% in overall length and 36% in weight compared to comparable lenses incorporating only conventional refractive optical elements. Moreover, the size and weight advantage comes at no cost to image quality, with the EF400mm F4 DO IS USM delivering performance equivalent to conventional models in its class. Lens Type: Super Telephoto Prime Focal length - wide (mm): 400 Focal length - tele (mm): 400 Max aperture – wide: 4 Max aperture – tele: 4 Minimum aperture: 32 Minimum focus distance (m): 3.5 Lens mount: Canon EF Lens elements: 17 Lens groups: 13 Filter thread (mm): 52 Size: 232.7 x 128mm Weight (g) 1940
Comes with hood, Hood Cap, Hard case, Tripod mount, strap, Rear cap, Real-tree Camo slip on cover (not the fitted neoprene type).