Tokina AT-X Pro 12-24mm f/4 AF DX 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 Tokina AT-X Pro 12-24mm f/4 AF DX

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Manufacturer Tokina
Release Date and Price
Release Year 2004
MSRP N/A
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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 30 cm
Autofocus (AF) Yes
Built-in autofocus (AF) motor Canon
Nikon
Nikon; for autofocus the camera has to have a built-in autofocus (AF) motor
See a list of compatible cameras
Aperture
Maximum aperture f/4
Optics
Elements: 13 elements / 11 groups
Focal Range: 12-24 mm

This is a "DX" lens, designed for APS-C sensors, and will have a focal length equivalent to: 
On Canon cameras: 19-38 mm
On Nikon cameras: 18-36 mm

Read more on the cameras impact on the perceived focal length
Physical
Diameter 84 mm
Length 89 mm
Weight 570 g (see the total weight, camera+lens)
Other
Image stabilization No
Filter Filter Thread, 77 mm
Lens Hood BH-777 (included)
Tripod mount No (Read more)
Weather sealing No