The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 10-20mm F4-5.6 EX DC HSM and the Tamron 10-24mm F3.5-4.5 Di II VC HLD 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. Tamron 10-24mm F3.5-4.5 Di II VC HLD is the longer of the two lenses at 85mm. The Sigma 10-20mm F4-5.6 EX DC HSM with a length of 81mm, is 4mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 84mm.
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, 6% (30g) lighter than the Sigma 10-20mm F4-5.6 EX DC HSM's weight of 470g.
Filter Threads
Both the Sigma 10-20mm F4-5.6 EX DC HSM and the Tamron 10-24mm F3.5-4.5 Di II VC HLD have the same Filter thread size of 77mm.
Below are links to the 77mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Sigma 10-20mm F4-5.6 EX DC HSM has the Canon EF lens mount whereas the Tamron 10-24mm F3.5-4.5 Di II VC HLD has the Canon EF-S 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 Mount and Canon T8i, Canon 90D and Canon SL3 for the Canon EF-S Mount.
Sigma 10-20mm F4-5.6 EX DC HSM is also available in Four Thirds , Pentax KAF, Sony Alpha, Sigma SA and Nikon F (DX) mounts.
Tamron 10-24mm F3.5-4.5 Di II VC HLD is also available in Nikon F (DX) mount.
Focal Range
Sigma 10-20mm F4-5.6 EX DC HSM has a focal range of 10-20mm and
2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
16-32mm when used on a APS-C / DX format camera.
On the other hand, the 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.