The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon 20-35mm f3.5-4.5 USM and the Tamron 17-35mm f2.8-4 LD 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 17-35mm f2.8-4 LD is the longer of the two lenses at 87mm. The Canon 20-35mm f3.5-4.5 USM with a length of 69mm, is 18mm shorter. On the other hand, the Canon 20-35mm f3.5-4.5 USM has a larger diameter of 84mm compared to the Tamron 17-35mm f2.8-4 LD's 83mm 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. Canon 20-35mm f3.5-4.5 USM weighs 340g, which means it is 100g (22%) lighter than the Tamron 17-35mm f2.8-4 LD which has a weight of 440g.
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
Both the Canon 20-35mm f3.5-4.5 USM and the Tamron 17-35mm f2.8-4 LD 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
Both the Canon 20-35mm f3.5-4.5 USM and the Tamron 17-35mm f2.8-4 LD 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.
Tamron 17-35mm f2.8-4 LD is also available in Nikon F (FX) mount.
Focal Range
Canon 20-35mm f3.5-4.5 USM has a focal range of 20-35mm and
1.8X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
32 - 56mm.
On the other hand, the Tamron 17-35mm f2.8-4 LD has a focal range of 17-35mm and 2.1X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 27.2 - 56mm.