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 Tamron 10-24mm f3.5-4.5 II LD for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sigma 12-24mm F4 DG HSM is the longer of the two lenses at 132mm. The Tamron 10-24mm f3.5-4.5 II LD with a length of 84mm is 48mm shorter. Besides being longer, the Sigma 12-24mm F4 DG HSM also has a larger diameter of 101mm compared to Tamron 10-24mm f3.5-4.5 II LD's 83mm diameter.
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. Tamron 10-24mm f3.5-4.5 II LD weighs 406g, 64% (745g) lighter than the Sigma 12-24mm F4 DG HSM's weight of 1151g.
Below you can find the dimension and weight table of the 'Wideangle Zoom Lenses in Canon EF Mount for size comparison purposes.
Wideangle Zoom Lenses in Canon EF Mount for Size Comparison
Both Sigma 12-24mm F4 DG HSM and Tamron 10-24mm f3.5-4.5 II LD 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.
Tamron 10-24mm f3.5-4.5 II LD is also available in Nikon F (DX) , Sony Alpha, Pentax KAF and Canon EF mounts.
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 an 35mm (FF) equivalent of 19.2 - 38.4mm.
Tamron 10-24mm f3.5-4.5 II LD has a focal range of 10-24mm and 2.4X zoom ratio which has a 35mm equivalent focal range of 16-38.4mm when used on a APS-C / DX format camera.