Sigma EX 10-20mm f/3,5 DC HSM Specifications

Next to each category and value there are articles describing it all, giving you a deeper understanding on every area so you can better understand the strengths and weaknesses.

Product
Name Sigma EX 10-20mm f/3,5 DC HSM

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Manufacturer Sigma
Release Date and Price
Release Year 2008
MSRP 950 USD
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Lens Type
Lens Type Wide Angle Zoom Lenses
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)
Focus
Closest Focusing Distance 24 cm
Autofocus (AF) Yes
Built-in autofocus (AF) motor Yes (more info)
Aperture
Maximum aperture f/3,5
Optics
Elements: 13 elements / 10 groups
Focal Range: 10-20 mm

This is a "DC" lens, designed for APS-C sensors, and will have a focal length equivalent to: 
On Canon cameras: 16-32 mm
On Nikon cameras: 15-30 mm

Read more on the cameras impact on the perceived focal length
Physical
Diameter 87 mm
Length 88 mm
Weight 520 g (see the total weight, camera+lens)
Other
Image stabilization No
Filter Filter Thread, 82 mm
Lens Hood LH873-01 202 (included)
Tripod mount No (Read more)
Weather sealing No