EF 400 mm DO IS USM
The world's first multi-layer DO element for telephoto lens Small and light High image quality Image Stabilization for equivalent effect of a shutter speed of two stops faster Highly resistant against dust and moisture
Built to our professional standards with fast AF, full-time mechanical focus and dust and water-resistant construction
The EF 400mm f/4 DO IS USM is the worlds first super telephoto lens incorporating "Multi-Layer Diffractive Optical (DO) Element", for camera lenses, and is considered a major breakthrough. The outstanding feature, being its superb ability to correct chromatic aberrations. By incorporating this optical element in the optical design the EF 400mm f/4 IS USM is much smaller and lighter than a comparable lens having conventional optical elements. The Multi-Layer Diffractive Optical Element developed by Canon is a milestone optical element possessing the characteristics of both fluorite and aspherical elements, which has led to the production of high-performance camera lenses.
Canon EF 400 mm DO IS USM. Lens structure (elements/groups): 17/13, Thread diameter: 12.8 cm, Diagonal angle of view (max): 6°. Filter size: 5.2 cm, Weight: 1.94 kg. Magnification: 0.12x