Sigma 12-24mm f/4.5-5.6 lens

The Sigma 12-24mm f/4.5-5.6 EX DG HSM is a professional-level wide-angle zoom lens made by Sigma Corporation.[1] It was once the widest rectilinear lens available (with this distinction has since been taken over by Canon EF 11-24mm f/4L) for full-frame 35mm SLR cameras, providing a field of view of 122 degrees. It is still the widest full-frame rectilinear lens available for Nikon as of 2016. This distinction has been taken over by the Irix 11mm f/4 lens released in 2017.[2] However, the Sigma lens still remain the widest autofocus full-frame zoom lens available for Nikon camera as the Irix lens is a manual focus prime lens. Other lenses available with focal lengths of 12mm or less are either incompatible with full-frame cameras or are intentionally distorted. The Sigma 12-24 has low distortion even compared to less wide zooms like the Canon EF 16-35mm lens.[3]

12-24mm F4.5-5.6

Maker	Sigma
Technical data
Type	Zoom
Focal length	12-24mm
Crop factor	1.0
Aperture (max/min)	f/4.5-f/22
Close focus distance	28cm
Max. magnification	1:7.1
Diaphragm blades	6
Construction	16 elements in 12 groups
Features
Short back focus	No
Ultrasonic motor	Yes
Lens-based stabilization	No
Macro capable	No
Application	Landscape
Physical
Max. length	102.5mm
Diameter	87mm
Weight	600g
Filter diameter	rear gelatin
Accessories
Lens hood	built-in
Angle of view
Diagonal	122 to 84.1 degrees
History
Introduction	June 2003
Retail info
MSRP	1050 USD

This lens is available in Canon, Nikon, and Sigma, Pentax, and Sony mounts. HSM focusing is available only in the Canon, Nikon, and Sigma variants.[4] The build quality is typical of Sigma EX lenses, with a painted metal lens barrel and damped focus and zoom rings. As expected for a lens of these specifications, there is a large protruding front element.[5]