The very first DO (Diffractive Optics) lens produced by Canon is a relatively small and light super telephoto lens. In terms of size it is a rather large lens, yet can be considered small due to its comparison with other similar lenses. It is much more hand-holdable lens than some of the other models, making it easier to maneuver for most users. The Canon EF 400mm f/4 DO IS USM makes a wonderful combination of speed and quality that promotes satisfaction amongst all its users.
 Test Chart for Canon EF 400mm f 4 DO IS USM Lens  US $11.95
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 Large Test Chart for Canon EF 400mm f 4 DO IS USM Lens US $27.95
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 Canon EF 400mm f 4 DO IS USM Super Telephoto Lens US $6,145.00
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One of the most useful tools of the Canon EF 400mm f/4 DO IS USM is its impressive image stabilization program. It combines light and a fast lens along with the image stabilization to make it possible to handhold the lens. It features two different modes that give the photographer the choice between a stop motion choice, or a panning mode that allows panning with a moving subject while the stabilizer maintains a steady image.
The Canon EF 400mm f/4 DO IS USM has a utilizing ring ultrasonic motor that helps it focus very fast, quietly, and most importantly, accurately. It is a reasonably sharp lens that enables full time manual focusing. The EF 400mm f/4 DO IS USM does a pretty good job at adjusting to different light settings as well, and shows very little distortion in the final product. At just 4.3 pounds and a minimum focus distance of 11.5, there is little question about the quality of this lens.
Overall the Canon EF 400mm f/4 DO IS USM is an excellent lens that can be used for a variety of different things. It makes a wonderful wildlife lens and an even more impressive action sports lens. The Canon EF 400mm f/4 DO IS USM takes far off objects and places them right in front of your face.
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