佳能EF 17-40mm F4L USM镜头是2004年跟随EOS10D数码单反推出的一款超广角镜头，虽说是红圈L镜头，但是它的价格相对比较便宜，所以这支镜头在佳能单反使用者口中创造了不错的口碑。. 它的做工非常精致，整体造型与第一代的16-35mm镜头差不多，只不过在长度和重量 Please note that Canon offices in Hong Kong, EF17-40mm f/4L USM. Specifications. Angle of View (Diagonal) Prices, specifications, availability and terms of Boasting weather-resistant construction similar to other high-end L-series cameras, the lens carries a one-year warranty. Focal length: 17-40mm. Maximum aperture: 1:4. Lens construction: 12 elements in 9 groups. Diagonal angle of view: 104 to 57 degrees (at 30 feet) Focus adjustment: Inner focusing system with USM. 您当前在 首页 EF变焦镜头旧产品 EF 17-40mm f/4L USM EF 16-35mm f/2.8L II USM EF 17-40mm f/4L USM EF 24-70mm f/2.8L USM EF 24-105mm f/4L IS USM EF 24−105mm f/3.5-5.6 IS STM EF 28-135mm f/3.5-5.6 IS USM EF 70-200mm f/2.8L IS II USM EF 70-200mm f/2.8L IS USM EF 70-200mm f/2.8L USM EF 70-200mm f/4L IS USM Canon EOS R8 Canon EF 50mm F1.4 USM Canon EF 85mm F1.8 USM Canon EF 17-40mm f/4.0L USM HDRsoft Photomatix Pro +3 more Reply Reply with quote Reply to thread Complain has a silent focus motor built into the lens. Canon EF 17-40mm f/4L USM. Sigma 24-105mm F4 DG OS HSM A. Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor. minimum focus distance. The Canon EF 17-40mm f/4.0L USM Lens shares the 16-35's small lens element extension feature, and the 17-40's manual indicates that a filter completes the sealing. The 16-35 manual does not specify this. At 16mm, the Canon EF 16-35mm f/2.8L USM Lens is very sharp in the center even wide open (f/2.8) and improves little when stopped down. 2 days ago · The Canon EF 17-40mm f/4L USM is another versatile wide-angle zoom lens. It gives you a good focal length range. You won’t see much distortion, even at the extremes. And budget-conscious photographers will appreciate the price tag. The EF17-40mm f/4L USM has 12 lens elements arranged in nine groups. Super Spectra coating ensures excellent colour balance and minimises ghosting and flare. To provide superb image quality over the complete 17-40mm zoom range the lens uses three aspheric elements. Super UD (Ultra-low Dispersion) glass prevents chromatic aberrations. Shop the EF 17-40mm f/4L USM from Canon U.S.A., Inc. A new and affordable L-series ultra-wide-angle zoom lens that's ideal for both film and digital SLRs. KYFMv.