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| Canon EF 17–40mm lens ： ウィキペディア英語版 |
Canon EF 17–40mm lens
The EF 17–40mm 4L USM lens is a wide-angle lens made by Canon Inc. The lens has an EF mount to work with the EOS line of cameras. Other than the front element, it is sealed against dust and water, and features a diaphragm which remains nearly circular from 4 to 8.
==Audience==
The 17–40mm is the least expensive of Canon's wide angle zooms, with the EF 16–35mm 2.8L USM and the EF 20–35mm 2.8L being both faster and more expensive. Weighing 475 g and measuring 83.5 mm x 96.8 mm, it is a popular choice with many photographers because of its light and compact size.〔(【引用サイトリンク】 title=10 POPULAR POINTS OF THE CANON EF 17–40MM F/4.0 L USM LENS )〕 A member of the L-series, the 17–40mm is a good substitute for the 16–35mm 2.8 lens, which is heavier and costs approximately twice as much. However, it should be noted that Canon now sells an image-stabilized 16–35mm 4 lens for about $300 more than the 17–40.
This lens is also a popular step up from the stock kit lens on many of Canon's EOS Digital family of cameras, the EF-S 18–55mm 3.5–5.6, for those still wanting a wide angle lens. On a cropped sensor, it has 35 mm equivalent focal length of 27–64mm. In this role, it is compared with the EF-S 17–55mm lens.
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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