|
|
Canon EF - Wide-angle zoom lens - 17 mm - 40 mm - f/4.0 L USM - Canon EF at Backoffice
Canon EF - Wide-angle zoom lens - 17 mm - 40 mm - f/4.0 L USM - Canon EF
8806A003AA
|
This product is no longer available.
|
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. While it is an excellent lens when used with an analog 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. The EF17-40mm f/4L USM has 12 lens elements arranged in 9 groups. Super Spectra Coating on the elements ensures excellent color balance and minimizes 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. 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 polarizing 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.| Product Description | Canon EF wide-angle zoom lens - 17 mm - 40 mm | | Lens System | Wide-angle zoom lens | | Mounting Type | Canon EF | | Lens Aperture | F/4.0 | | Focal Length | 17 mm - 40 mm | | Min Focus Range | 28 cm | | Focus Adjustment | Automatic, manual | | Lens Construction | 9 group(s) / 12 element(s) | | Special Functions | Wide angle, zoom | | Filter Size | 77 m | | Length | 9.7 cm | | Weight | 500 g |
GENERAL |
| Length | 9.7 cm |
| Diameter | 8.4 cm |
| Weight | 500 g |
LENS SYSTEM |
| Type | Wide-angle zoom lens |
| Special Functions | Wide angle, zoom |
| Focal Length | 17 mm - 40 mm |
| Lens Aperture | F/4.0 |
| Magnification | 0.24 |
| Min Focus Range | 28 cm |
| Focus Adjustment | Automatic, manual |
| Zoom Adjustment | Manual |
| Max View Angle | 104 degree(s) |
| Min View Angle | 57.5 degree(s) |
| Lens Construction | 9 group(s) / 12 element(s) |
| Filter Size | 77 m |
| Diaphragm Blades | 7 |
| Lens Coating | Super Spectra coating |
| Mounting Type | Canon EF |
| Features | UD glass, internal focusing system, Ultrasonic Motor (USM), full-time manual focusing, rear focusing system, rear filter mount, aspherical lens |
MISCELLANEOUS |
| Included Accessories | Dust cap, lens cap |
|
|
|
