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Optical design
| Format: APS-C (crop)
Type: Zoom lens
Focusing: Auto Focus (AF)
Lens mounts: Canon EF, EF-S, Canon EF, EF-S, Canon EF, EF-S, Canon EF, EF-S
First year of production: 2006
Optical design: 19 elements in 12 groups (three aspherical and two extra-low dispersion)
Features: Ultra-Sonic Motor, Optical stabilisation | |
Specifications:
| Focal length | Max. aperture | Min. aperture | Blades | Min. Focus (m.) | Filter Ø (mm.) | Weight (gr/oz) | Length (mm/in) |
|---|
| 17mm - 55mm | f/2.8 | f/22 | 7 | 0.35 | 77 | 645/22,8 | 111/4,4 |
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Additional information:
The Canon EF-S 17-55 mm f/ 2.8 IS USM
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for APS-C cameras only with the EF-S bayonet mount
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equivalent focal length 27-88
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constant max. aperture of f/2.8 throughout the entire zoom range
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diagonal angle of view 78º 30' – 27º
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horizontal angle of view 68º 40' –23º 20'
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vertical angle of view 48º – 15º 40'
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max. magnification ratio 0.17 (at 55 mm)
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magnification with Extension Tube EF12 II 0.45 – 0.23
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magnification with Extension Tube EF25 II 1.71 – 0.51
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the lens transmits distance information to the camera
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ring-type USM autofocus drive
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internal focusing - the filter does not rotate
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full-time focusing (FTM)
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maximum diameter 83.5 mm
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EW-83J hood
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LP1219 soft case
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incompatibility with EF1.4x II and EF2x II extenders
Canon EF-S 17-55mm f/2.8 IS USM is a high-quality fast standard zoom lens (only for APS-C cameras with the EF-S bayonet mount) with a 3-stop image stabilizer. The IS automatically detects when the camera is mounted on a tripod, thus preventing feedback loops between the IS sensor and stabilizer motor vibrations.
The optical scheme of the lens includes three high-precision aspherical elements and two Ultra-Low Dispersion glass elements ensuring a high-quality image throughout the zoom range.
The improved Super Spectra coating reduces flare and ghosting effect, caused by image sensor reflection, when used on digital cameras.
High resolution, high lens speed, fast and accurate focusing, and soft bokeh make the Canon 17-55 mm f/ 2.8 IS USM a powerful tool for crop factor cameras
Links to online resources:
PDF Files:
Posted by: dv Date of publication: 08.10.2010
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