The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 10-24mm F3.5-4.5 Di II VC HLD and the Sigma 12-24mm F4.5-5.6 EX DG HSM 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 F4.5-5.6 EX DG HSM is the longer of the two lenses at 103mm. The Tamron 10-24mm F3.5-4.5 Di II VC HLD with a length of 85mm, is 18mm 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 Tamron 10-24mm F3.5-4.5 Di II VC HLD's 84mm 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. Tamron 10-24mm F3.5-4.5 Di II VC HLD weighs 440g, which means it is 160g (26%) lighter than the Sigma 12-24mm F4.5-5.6 EX DG HSM which has a weight of 600g.
Lens Mounts
The Tamron 10-24mm F3.5-4.5 Di II VC HLD has the Canon EF-S lens mount whereas the Sigma 12-24mm F4.5-5.6 EX DG HSM has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Canon T8i, Canon 90D and Canon SL3 for the Canon EF-S Mount and Canon 1D X III, Canon 6D MII and Canon 5D MIV for the Canon EF Mount.
Tamron 10-24mm F3.5-4.5 Di II VC HLD is also available in Nikon F (DX) 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.
Focal Range
Tamron 10-24mm F3.5-4.5 Di II VC HLD has a focal range of 10-24mm and
2.4X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
16-38.4mm when used on a APS-C / DX format camera.
On the other hand, the 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.