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Canon EF-S 17-55mm f/2.8 IS USM

see the whole gallery in large	APS-C sized image Lenses that create APS-C sized image are designed for digital only. They cannot be used on cameras that have image sensor larger than the APS-C format. These lenses are not suitable for film cameras either. Ultrasonic AF Lenses with ultrasonic focusing mechanism tend to be quiter and faster than traditionally focusing lenses. No stepping motor AF Lenses with stepping motor focusing mechanism are better for contrast based focusing, and are quiter and faster than traditionally focusing lenses. One or more Low Dispersion lens element is used Low Dispersion lens elements help to reduce chromatic aberration. Built-in image stabilizer Image stabilization helps to reduce blur caused by hand shake, especially at high focal length or in low light situations. Image stabilization can give 1 to 3 stop advantage over none stabilized lens, based on the reciprocal rule. Metal mount Cheaper lenses are usually equipped with plastic mount, while more expensive, professional lenses have metal mount. In general, metal mounts are more durable, and a good thing to have when lenses are changed a lot. When a camera is used mainly with one lens, the material of the lens mount is not that important. Internal Focusing Internally focusing lenses don't change their size while setting focus. No Internal Zoom Internally zooming lenses don't change their size while focal length is changing. The front lens is fixed The fixed front lens is not rotating during zoom and/or focusing. This allows the photographer to use petal shaped lens hood. Fixed front lenses also make the use of polarization filters a lot easier. Not Sealed Weather sealed lenses are protected from dust and water. While they are not water proof, these lenses can be used in rain and other humid environments. Some sealings only provide protection against dust or water, not both. Sealing is only available when the lens is used on a similarly weather sealed camera body. No drop-in filter support Drop-in filters are used in those lenses where either the front lens is too large, or the field of view doesn't permit the use of traditional filters at the front of the lens. Usually bright tele and ultra-wide angle lenses support this filter type.
With an effective focal length range of approximately 27-88mm (35 mm equivalent), the EF-S 17-55mm f/2.8 IS USM is a powerful lens that delivers remarkable image quality. The wide angle zoom allows you to capture more of every scene and add a new sense of space and perspective to your photography. The large f/2.8 aperture provides excellent results in low light conditions. The aperture remains constant through the full focal length range, allowing you to zoom from approximately 27-88mm (35 mm equivalent) without slowing shutter speed. IS allows use of shutter speeds up to 3 stops slower with no perceptible increase in image blur. IS helps with low light conditions, fast paced scenes and shooting from moving vehicles. Full time manual focus override is available without having to switch out of AF. Optimised Super Spectra lens coatings and lens element shaping suppress flare and ghosting - more prone to occur with digital cameras due to reflection off the image sensor. Coatings also help achieve true colour balance and increase contrast for vivid hi-fidelity images.

see the whole gallery in large

With an effective focal length range of approximately 27-88mm (35 mm equivalent), the EF-S 17-55mm f/2.8 IS USM is a powerful lens that delivers remarkable image quality. The wide angle zoom allows you to capture more of every scene and add a new sense of space and perspective to your photography. The large f/2.8 aperture provides excellent results in low light conditions. The aperture remains constant through the full focal length range, allowing you to zoom from approximately 27-88mm (35 mm equivalent) without slowing shutter speed. IS allows use of shutter speeds up to 3 stops slower with no perceptible increase in image blur. IS helps with low light conditions, fast paced scenes and shooting from moving vehicles. Full time manual focus override is available without having to switch out of AF. Optimised Super Spectra lens coatings and lens element shaping suppress flare and ghosting - more prone to occur with digital cameras due to reflection off the image sensor. Coatings also help achieve true colour balance and increase contrast for vivid hi-fidelity images.

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Canon EF-S 17-55mm f/2.8 IS USM Specification

Canon EF-S 17-55mm f/2.8 IS USM Specification
Available mount(s)	Canon EF-S
Application(s)	Portrait, Landscape, Architecture
Category(s)	Standard zoom
Multiplier	1.5×
Stabilizer	yes (3 f-stop advantage)
Focal length	17 - 55 mm (3.2× zoom)
Lens construction	19 elements in 12 groups
Angle of view	35mm: N/A digital: 78.5-27.2°
Number of blades	7
Maximum aperture	wide: f/2.8 tele: f/2.8
Minimum aperture	wide: f/22 tele: N/A
Minimum focusing distance	35 cm
Magnification	0.17×
Filter size	77 mm
Size	∅ 83.5 × 110.6 mm
Weight	645 g
Notes	Mechanical full-time manual focusing built-in. Image Stabilizer: 3-stops
AF speed	N/A
AF sound
Internal focusing	yes
Internal zoom	no
Fix front lens	yes
Mount type	metal
Weather sealed	no
Drop in filter	no
Ultrasonic AF	yes
Stepping motor AF	no
APS-C sized circle	yes
Low dispersion lens element	yes
Hard case	N/A
Soft case	LP1219 (not included)
Lens hood	EW-83J (not included) printable lens hood
Tripod adapter	N/A