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
The size of a lens is a crucial factor to consider 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 the Tokina 12-28mm f4 Pro DX'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. 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.
Ultra-Wideangle Lenses in Canon EF Mount for Size Comparison
Filter Threads
The Tokina 12-28mm f4 Pro DX has a filter size of 77mm whereas the Sigma 10-20mm F3.5 EX DC HSM has a 82mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Tokina 12-28mm f4 Pro DX:
And these are the 82mm filters that we recommend for the Sigma 10-20mm F3.5 EX DC HSM:
Lens Mounts
Both the Tokina 12-28mm f4 Pro DX and the 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.
On the other hand, the 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.