Sigma 18-50mm f/2,8-4,5 DC OS HSM Specifications

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Name Sigma 18-50mm f/2,8-4,5 DC OS HSM

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Manufacturer Sigma
Release Date and Price
Release Year 2009
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Lens Type
Lens Type standard zoom Lens
Zoom or Prime Zoom lens (with the ability to zoom in and out)
Mount and Compatibility
Mount Canon (see compatible cameras)
Nikon (see compatible cameras)
Compatibility Designed for APS-C cameras (see compatible cameras)
Closest Focusing Distance 30 cm
Autofocus (AF) Yes
Built-in autofocus (AF) motor Yes (more info)
Maximum aperture f/2,8-4,5
The lens aperture and brightness varies at different focal lengths.
f/2,8 at 18 mm
f/4,5 at 50 mm
(Read more)
Elements: 16 elements / 12 groups
Focal Range: 18-50 mm

This is a "DC" lens, designed for APS-C sensors, and will have a focal length equivalent to: 
On Canon cameras: 29-80 mm
On Nikon cameras: 27-75 mm

Read more on the cameras impact on the perceived focal length
Diameter 74 mm
Length 88 mm
Weight 395 g (see the total weight, camera+lens)
Image stabilization Yes, OS
Filter Filter Thread, 67 mm
Lens Hood LH730-02 580 (included)
Tripod mount No (Read more)
Weather sealing No