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 average price Lab Test Results. Results: Canon 7D; Results: Canon 1DsMk3; Blur; Canon EF 17-40mm ƒ/4L USM ~$850 A stalwart lens and a favorite in many a shooter's bag, the 17-40mm is a very Spanning a versatile wide-angle range, the EF 17-40mm f/4L USM Lens is a Canon L-series zoom featuring a constant f/4 maximum aperture along with a sophisticated optical design and durable construction. 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. .

canon ef 17 40mm f 4l usm price