The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 12-24mm F4 DG HSM and the Tokina AT-X 14-20mm F2 Pro DX for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Sigma 12-24mm F4 DG HSM is the longer of the two lenses at 132mm. The Tokina AT-X 14-20mm F2 Pro DX with a length of 106mm, is 26mm shorter. Besides being longer, the Sigma 12-24mm F4 DG HSM also has a larger diameter of 101mm compared to the Tokina AT-X 14-20mm F2 Pro DX's 89mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Tokina AT-X 14-20mm F2 Pro DX weighs 725g, 37% (426g) lighter than the Sigma 12-24mm F4 DG HSM's weight of 1151g.
Lens Mounts
Both the Sigma 12-24mm F4 DG HSM and the Tokina AT-X 14-20mm F2 Pro DX has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Sigma 12-24mm F4 DG HSM is also available in Sigma SA and Nikon F (FX) mounts.
Tokina AT-X 14-20mm F2 Pro DX is also available in Nikon F (DX) mount.
Focal Range
Sigma 12-24mm F4 DG HSM has a focal range of 12-24mm and
2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
19.2 - 38.4mm.
On the other hand, the Tokina AT-X 14-20mm F2 Pro DX has a focal range of 14-20mm and 1.4X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 22.4-32mm when used on a APS-C / DX format camera.