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About Canon EF 400mm F/4 DO IS II USM Lens
Product Description The Canon EF 400mm f/4.0 DO IS II Image Stabilizer USM Autofocus Lens delivers brilliant high-speed performance for professionals with minimal glare and superb image quality. Taking advantage of the best in lens technology, it features gapless dual-layer diffractive optical elements for improved diffraction efficiency with reduced flare. From the Manufacturer EF 400mm f/4 DO IS II USM The EF 400mm f/4 DO IS II USM lens delivers brilliant high-speed performance for professionals with minimal glare and superb image quality. Taking advantage of the best in lens technology, it features gapless dual-layer diffractive optical elements for improved diffraction efficiency with reduced flare. These elements are arranged with a large-diameter ground aspheric lens and a UD lens for a new level of sharpness and clarity. New coatings help to reduce ghosting, ensure excellent color balance and reduce fingerprints on the front and rear of the lens. Professional L-series dust- and water-resistant construction is complemented by impressive performance: a 3 mode Image Stabilization system offers up to four stops of compensation and can even prevent operational errors when the camera is mounted on a tripod. AF stop buttons placed on the front of the lens can automatically stop focusing at any time; full time manual focus ensures complete control no matter the AF mode, and a Power Focus (PF) mode makes for smooth focus transitions when shooting movies. The EF 400mm f/4 DO IS II USM focuses down to 10.8 ft. (3.3 meters), has a 9-blade aperture for pleasing, soft, out-of-focus areas, and is constructed with lead-free glass. Specifications Focal Length & Maximum Aperture: 400mm 1:4 Lens Construction: 18 elements in 12 groups Diagonal Angle of View: 6°10' Focus Adjustment: Inner focusing system with USM Closest Focusing Distance: 10.83 ft. / 3.3m Filter Size: 52mm drop-in Max Diameter x Length, Weight: Approx. 5.04 x 9.16 in. / 128 x 232.7 mm, Approx. 74.1 oz. / 2100 g Sample Image MTF Charts
