Overview: The Sigma 17-50mm F2.8 DC OS HSM (Model #583) is a
high quality, large aperture standard zoom lens. Typical uses include travel,
landscape, wedding, events, portrait, and family photography. The lens has the
Canon EF-Mount, and comes with a lens hood, front and rear caps, and a zippered storage case.
Lens Hood: The 17-50mm lens includes a bayonet-type
detachable lens hood to help
prevent stray light from entering the lens, causing flare, and to protect the
lens from rain, snow, and dust. When not in use, the lens hood can be inverted
and mounted onto the lens backwards for storage.
Focus Mode Switch: The lens features a two-way switch for
setting the focus mode: AF (auto focus) or M (manual focus).
Optical Stabilization (OS): The lens also has a two-way
switch to activate (or turn off) the built-in optical stabilization. When
switched to the On position, the optical stabilization compensates for camera
shake, especially in low-light or long zoom situations when the camera is
hand-held. Using the OS feature, it is possible to get sharp results at shutter
speeds approximately 4 stops slower than you could without it.
Sigma DC Lenses: This Sigma DC lens is designed for use with
digital SLRs with APS-C-sized image sensors. The image circle matches the
smaller size of the image sensor of most digital cameras.
HSM: The lens has a hyper-sonic motor (HSM) that provides a
quiet, high-speed auto focusing mechanism.
- Lens Construction: 17 Elements in 13 Groups
- Angle of View: 72.4°-27.9°
- Number of Diaphragm Blades: 7
- Maximum Aperture: f/2.8
- Minimum Aperture: f/22
- Minimum Focusing Distance: 11"
- Filter Size: 77mm
- Maximum Magnifications: 1:5
- Dimensions: Diameter=3.284", Length=3.876", (4.463"
- Weight: 19.9 ounces
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