The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 12-24mm F4.5-5.6 EX DG HSM and the Canon 10-22mm f3.5-4.5 USM for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Sigma 12-24mm F4.5-5.6 EX DG HSM is the longer of the two lenses at 103mm. The Canon 10-22mm f3.5-4.5 USM with a length of 90mm, is 13mm shorter. Besides being longer, the Sigma 12-24mm F4.5-5.6 EX DG HSM also has a larger diameter of 87mm compared to the Canon 10-22mm f3.5-4.5 USM's 84mm diameter.
The weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Canon 10-22mm f3.5-4.5 USM weighs 385g, 35% (215g) lighter than the Sigma 12-24mm F4.5-5.6 EX DG HSM's weight of 600g.
The Sigma 12-24mm F4.5-5.6 EX DG HSM has the Canon EF lens mount whereas the Canon 10-22mm f3.5-4.5 USM has the Canon EF-S lens mount. Some of the latest released cameras that are compatible with these mounts are Canon 1D X III, Canon 6D MII and Canon 5D MIV for the Canon EF Mount and Canon T8i, Canon 90D and Canon SL3 for the Canon EF-S Mount.
Sigma 12-24mm F4.5-5.6 EX DG HSM is also available in Pentax KAF , Sony Alpha, Sigma SA and Nikon F (FX) mounts.
Sigma 12-24mm F4.5-5.6 EX 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.
Canon 10-22mm f3.5-4.5 USM has a focal range of 10-22mm and 2.2X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 16-35.2mm when used on a APS-C / DX format camera.