The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 28-45mm F1.8 and the Tokina AT-X 14-20mm F2 Pro DX 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 28-45mm F1.8 is the longer of the two lenses at 151mm. The Tokina AT-X 14-20mm F2 Pro DX with a length of 106mm, is 45mm shorter. On the other hand, the Tokina AT-X 14-20mm F2 Pro DX has a larger diameter of 89mm compared to the Sigma 28-45mm F1.8's 88mm 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. Tokina AT-X 14-20mm F2 Pro DX weighs 725g, 24% (235g) lighter than the Sigma 28-45mm F1.8's weight of 960g.
Filter Threads
Both the Sigma 28-45mm F1.8 and the Tokina AT-X 14-20mm F2 Pro DX have the same Filter thread size of 82mm.
Below are links to the 82mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Sigma 28-45mm F1.8 has the Leica L lens mount whereas the Tokina AT-X 14-20mm F2 Pro DX has the Nikon F (DX) lens mount. Some of the latest released cameras that are compatible with these mounts are Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount and Nikon D3500, Nikon D7500 and Nikon D5600 for the Nikon F (DX) Mount.
Sigma 28-45mm F1.8 is also available in the Sony E mount.
Tokina AT-X 14-20mm F2 Pro DX is also available in Canon EF mount.
Focal Range
Sigma 28-45mm F1.8 has a focal range of 28-45mm and
1.6X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
42 - 67.5mm.
On the other hand, the Tokina AT-X 14-20mm F2 Pro DX has a focal range of 14-20mm and 1.4X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 21-30mm when used on a APS-C / DX format camera.
