The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon 16-35mm F2.8L III 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. Canon 16-35mm F2.8L III is the longer of the two lenses at 128mm. The Tokina AT-X 14-20mm F2 Pro DX with a length of 106mm, is 22mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 89mm.
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, 8% (65g) lighter than the Canon 16-35mm F2.8L III's weight of 790g.
Filter Threads
Both the Canon 16-35mm F2.8L III 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
Both the Canon 16-35mm F2.8L III and the Tokina AT-X 14-20mm F2 Pro DX has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Tokina AT-X 14-20mm F2 Pro DX is also available in Nikon F (DX) mount.
Focal Range
Canon 16-35mm F2.8L III has a focal range of 16-35mm and
2.2X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
25.6 - 56mm.
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 22.4-32mm when used on a APS-C / DX format camera.