The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 17-35mm F2.8-4 Di OSD and the Canon 17-40mm f4.0L USM for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Canon 17-40mm f4.0L USM is the longer of the two lenses at 97mm. The Tamron 17-35mm F2.8-4 Di OSD with a length of 93mm is 4mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 84mm.
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. Tamron 17-35mm F2.8-4 Di OSD weighs 460g, which means it is 40g (7%) lighter than the Canon 17-40mm f4.0L USM which has a weight of 500g.
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 Tamron 17-35mm F2.8-4 Di OSD and Canon 17-40mm f4.0L USM 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 Di OSD is also available in Nikon F (FX) mount.
Focal Range
Tamron 17-35mm F2.8-4 Di OSD 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 an 35mm (FF) equivalent of 27.2 - 56mm.
Canon 17-40mm f4.0L USM has a focal range of 17-40mm and 2.4X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides an 35mm (FF) equivalent of 27.2 - 64mm.