The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tokina 12-28mm f4 Pro DX and the Sigma 10-20mm F3.5 EX DC HSM for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Tokina 12-28mm f4 Pro DX is the longer of the two lenses at 90mm. The Sigma 10-20mm F3.5 EX DC HSM with a length of 88mm is 2mm shorter. On the other hand, the Sigma 10-20mm F3.5 EX DC HSM has a larger diameter of 87mm compared to Tokina 12-28mm f4 Pro DX's 84mm 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. Sigma 10-20mm F3.5 EX DC HSM weighs 520g, 1% (10g) lighter than the Tokina 12-28mm f4 Pro DX's weight of 530g.
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
Lens Mounts
Both Tokina 12-28mm f4 Pro DX and Sigma 10-20mm F3.5 EX DC HSM has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon T8i, Canon 90D and Canon SL3.
Tokina 12-28mm f4 Pro DX is also available in Nikon F (DX) mount.
Sigma 10-20mm F3.5 EX DC HSM is also available in Pentax KAF3 , Sony Alpha, Sigma SA and Nikon F (DX) mounts.
Focal Range
Tokina 12-28mm f4 Pro DX has a focal range of 12-28mm and 2.3X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 19.2-44.8mm when used on a APS-C / DX format camera. Sigma 10-20mm F3.5 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.