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- EF-S-Mount Lens/APS-C Format
- 27.2-88mm (35mm Equivalent)
- Aperture Range: f/2.8 to f/22
- Two UD and Three Aspherical Elements
- Super Spectra Coating
- Ring-Type Ultrasonic Motor AF System
- Optical Image Stabilizer
- Rounded 7-Blade Diaphragm
Beskrivelse
A tremendously flexible standard zoom for APS-C-format DSLRs, the EF-S 17-55mm f/2.8 IS USM from Canon pairs the 27.2-88mm equivalent focal length range with a bright f/2.8 constant maximum aperture.
Benefitting this design is a sophisticated optical layout, which includes both Ultra-Low Dispersion glass and aspherical elements to significantly reduce chromatic and spherical aberrations for improved clarity and sharpness throughout the zoom range.
A Super Spectra coating has also been applied to individual elements to suppress flare and ghosting for increased contrast when working in bright environments.
Beyond the optical attributes, this 17-55mm is also characterized by its advanced three stop-effective Image Stabilizer system to minimize the appearance of camera shake.
Also complementing handling is a sophisticated ring-type USM, which provides quick, quiet, and accurate autofocus performance along with full-time manual focus override.
- Versatile wide-angle to portrait-length zoom is designed for APS-C-format Canon EF-S-mount DSLRs and offers a 27.2-88mm equivalent focal length range.
- Bright constant f/2.8 maximum aperture affords consistent illumination throughout the zoom range and also affords greater control over depth of field for working with selective focus techniques.
- Two Ultra-Low Dispersion glass elements noticeably reduce color fringing and chromatic aberrations for high clarity and color fidelity.
- Three aspherical elements minimize spherical aberrations and distortions for improved sharpness and accurate rendering.
- Super Spectra coating has been applied to individual elements to minimize ghosting and flare for greater contrast and color neutrality when working in strong lighting conditions.
- An Optical Image Stabilizer helps to minimize the appearance of camera shake by up to three shutter speed stops to better enable working in low-light conditions and with slower shutter speeds.
- A ring-type Ultrasonic Motor (USM), along with an internal focusing design and optimized focusing algorithms, is employed to deliver fast, precise, and quiet autofocus performance as well as full-time manual focus override.
- Rounded seven-blade diaphragm contributes to a pleasing out of focus quality that benefits the use of shallow depth of field and selective focus techniques.
Specifikationer
| Focal Length | 17 to 55mm (35mm Equivalent Focal Length: 27.2 to 88mm) |
| Maximum Aperture | f/2.8 |
| Minimum Aperture | f/22 |
| Lens Mount | Canon EF-S |
| Format Compatibility | APS-C |
| Angle of View | 78° 30' to 27° 50' |
| Minimum Focus Distance | 1.15' / 35 cm |
| Maximum Magnification | 0.17x |
| Optical Design | 19 Elements in 12 Groups |
| Diaphragm Blades | 7, Rounded |
| Focus Type | Autofocus |
| Image Stabilization | Yes |
| Filter Size | 77 mm (Front) |
| Dimensions (ø x L) | 3.29 x 4.35" / 83.5 x 110.6 mm |
| Weight | 1.42 lb / 645 g |