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| Canon EF 70-300mm lens ： ウィキペディア英語版 |
Canon EF 70–300mm lens
The EF 70–300mm lens is a telephoto zoom lens made by Canon Inc. The lens has an EF mount to work with the EOS line of cameras.
Three Canon EF telephoto zoom lenses carry the 70–300mm designation. These are the EF 70–300mm 4.5–5.6 DO IS USM, EF 70–300mm 4–5.6L IS USM and the EF 70–300mm 4–5.6 IS USM. All versions offer IS and USM and have nearly the same maximum aperture of 4/4.5 to 5.6 over their entire focal range. The optics of the Canon EF 70–300mm f/4–5.6 L USM lens include 19 elements in 14 groups, two of which are ultra-low dispersion (UD) glass.
==EF 70–300mm 4.5–5.6 DO IS USM==
This lens makes use of Canon's Diffractive Optics rather than a traditional lens of wholly refractive design. This allows the lens to be more compact, albeit heavier and much more expensive than a lens of conventional design. The lens contains Image Stabilization and a ring USM, which allows full time manual focusing of the lens while using the camera in single shot mode. This lens offers good optical quality with the caveat that the diffractive element does not deal with strong incident light sources as well as conventional designs.〔("Canon EF 70–300mm f/4.5–5.6 USM DO IS — Full Format Review / Test Report" at photozone.de ) (accessed 5 October 2010)〕
This lens is compatible with the Canon ET-65B lens hood.〔(Canon website's lens compatibility list for the ET-65B lens hood )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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