Canon EF 400mm f/4.0 DO IS USM

This lens is an EF 400 f/4.0 DO IS USM lens.

Features
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.

Photo Quote: The most refined skills of color printing, the intricate techniques of wide-angle photography, provide us pictures of trivia bigger and more real than life. We forget that we see trivia and notice only that the reproduction is so good. Man fulfils his dream and by photographic magic produces a precise image of the Grand Canyon. The result is not that he adores nature or beauty the more. Instead he adores his camera -- and himself. Daniel J. Boorstin