Canon EF 17-40mm f/4.0L USM, SLR, 12/9, Wide zoom, USM, Black, 83.5
Canon EF 17-40mm f/4.0L USM. Component for: SLR, Lens structure (elements/groups): 12/9, Lens type: Wide zoom. AF actuator: USM. Colour of product: Black. Diameter: 83.5, Length: 96.8. Magnification: 0.24
The EF17-40mm f/4L USM is a lightweight ultra wide angle Canon EF zoom lens. It is especially well suited for use with digital EOS SLR cameras with a focal length conversion factor higher than 1. Features -Superb optical performance throughout the zoom range. -Fastest AF speed within its class (same as the EF16-35 f/2.8L USM). -Highly dust and moisture resistant. -28cm minimum focusing distance at all focal lengths *as of January 2003. Ultra wide lens for analogue EOS SLR cameras The EF17-40mm f/4L USM is an ultra wide angle Canon EF zoom lens meant for professional and high amateur SLR EOS camera users. Standard zoom lens for digital EOS SLR cameras While it is an excellent lens when used with an analogue SLR camera, the EF17-40mm f/4L USM is especially well suited for digital SLR cameras with an imaging sensor size smaller than the 35mm format. Indeed on such digital SLR cameras these focal lengths can give an angle of view approximately equivalent to that of a 28-70mm lens used on a 35mm camera, which makes it the ideal standard zoom lens. Superior optical performance The EF17-40mm f/4L USM has 12 lens elements arranged in 9 groups. Super Spectra Coating on the elements ensures excellent colour balance and minimises ghosting and flare. To provide superb image quality over a 17-40mm zoom range the lens uses three aspheric elements of two different types, while Super UD (Ultra-low Dispersion) glass is used to prevent the chromatic aberrations that often can degrade the subject edge clarity. Extensive set of high-end features Minimum focusing distance is just 28mm throughout the entire zoom range. The Auto-focus works silently and quickly thanks to a fast central processing unit with an improved AF algorithm. You can override AF mode with manual focus should you wish. Controlled by an electromagnetic diaphragm, the EF17-40mm f/4L USM’s circular aperture can achieve a more attractive appearance to out of focus background areas in a picture. The front of the lens does not rotate as you focus. This means, for example, that polarising filters still function effectively as you zoom in and out. At the rear of the lens there’s a drop-in gelatin filter holder. Highly resistant to moisture and dust, the EF17-40mm f/4L USM is ideally suited for use in harsh environments. Environment friendly lead-free glass is used throughout its construction.
|Габариты||83.5 x 96.8 mm|
|Прочее||17-85mm standard zoom lens with f/4-5.6 maximum aperture for EOS digital SLR cameras; Image Stabilization system reduces camera shake to extend use in low-light levels; Aspheric element and 2 aspherical surfaces deliver excellent optical quality; Ring-type ultra-sonic monitor (USM) for superior autofocusing; 1.15-feet close focusing; Measures 3.1 inches in diameter and 3.6 inches long; weighs 16.8 ounces; 1-year warranty;|
|Длинна кабеля||Product Description: Canon EF-S 17-85MM f4-5.6 IS USM Lens is possibly the best single lens to own with your Canon Digital Rebel SLR Camera. Equivalent to a 28-135mm lens, this new EF-S lens brings true wide-angle to tele coverage to EOS 20D, 30D, 40D and Digital Rebel shooters. It has Canon's Image Stabilization system, allowing safe hand-holding at speeds up to three stops slower than otherwise possible. And of course, it's optically optimized for digital SLRs. A ring-type USM means both fast and silent AF, as well as full-time manual focus when in the AF mode. Circular aperture design -- natural highlights, even stopped down two stops Non-rotating front element; lens length does not change during zooming EF-S lens mount -- exclusively for EOS 20D and Digital Rebel bodies Filter Size - 67mm Maximum Diameter x Length, Weight - 3.1 x 3.6, 16.8 ounces Only compatible with the 40D, 30D, 20D;|