Reviews and Problems with Canon EF 70-300mm f/4.5-5.6 DO IS USM
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Canon EF 70-300mm f/4.5-5.6 DO IS USM Lens Review
SLR Lens and Camera Reviews
6 June 2009
Summary: Canon EF 70-300mm f/4.5-5.6 DO IS USM is a pretty unique lens in sense that it is one of the only two Canon lenses that incorporate diffractive optics. When the lens was first released in 2004 (following the release of Canon EF 400mm f/4 DO IS USM), Canon was believed to quickly follow up with additional lens models that would include DO elements. Yet four years later there are no new additions from Canon.
Excerpt: One of only two lenses that contains both refractive and diffractive glass elements, this image-stabilized tele zoom is dramatically more compact -- and expensive ($1,143, street) -- than its refractive-only Canon ($549, street) or Nikon ($479, street) counterparts. Unlike more common refractive optics, diffractive optical design is based on how light rays bend when forced to move around (not through) an obstruction -- in this case, a pattern of molded, sawtooth,...
Excerpt: As a long-term user of a Canon 75-300 IS USM lens I hoped that Canon would bring out an L-series version of this lens with better optical quality, especially at the 300mm end. When Canon introduced the 100-400 IS lens I bought one to get higher quality images of wildlife at long focal lengths but although the results were good, I found the lens very heavy to use and only carried it on specific projects.
Conclusion: The Canon EF 70-300mm f/4.5-5.6 DO IS USM is a compact, very fast-focusing zoom telephoto lens that provides generally excellent imaging function including excellent image stabilization at a high price. It is a weak performer at 300mm. It generally provides noticeably better performance than the cheaper consumer 75-300mm lens. Under some lighting conditions (e.g., backlighting of subject into the lens), the lens flares and renders images unusable.
Canon's EF 70-300mm f/4.5-5.6 DO IS USM An Incredibly Small, Fully-Corrected Telephoto Zoom With High-Tech Diffractive Optics
1 November 2001
Excerpt: When it was announced in 1995, the Canon EF 75-300mm f/4-5.6 IS USM zoom was truly unique, as the world's first 35mm system lens with a built-in Image Stabilizer (IS). Versatile, compact, and great for low-light shooting without a tripod, that zoom has been very popular in spite of mixed reviews about its imaging qualities. Recently, Canon announced a new and improved version, the EF 70-300mm f/4.5-5.6 DO IS USM, which is also unique.
Excerpt: Focusing is completely internal and the only indication is on the distance scale window. The Ultrasonic Motor is the ring type which is the better quality of the two types of USM motor that Canon fit as it uses a simple design of two rings, one attached to the focusing bits and the other is attached to the lens barrel. When one vibrates, it translates to the other as movement and the lens focuses.