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 Sigma 14-24mm F2.8 DG 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. Sigma 14-24mm F2.8 DG HSM is the longer of the two lenses at 135mm. The Tamron 17-35mm F2.8-4 Di OSD with a length of 93mm, is 42mm shorter. Besides being longer, the Sigma 14-24mm F2.8 DG HSM also has a larger diameter of 96mm compared to the Tamron 17-35mm F2.8-4 Di OSD'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. Tamron 17-35mm F2.8-4 Di OSD weighs 460g, which means it is 690g (60%) lighter than the Sigma 14-24mm F2.8 DG HSM which has a weight of 1150g.
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
Lens Mounts
Both the Tamron 17-35mm F2.8-4 Di OSD and the Sigma 14-24mm F2.8 DG HSM 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.
Sigma 14-24mm F2.8 DG HSM is also available in Nikon F (FX) and Sigma SA mounts.
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 a 35mm (FF) equivalent of
27.2 - 56mm.
On the other hand, the Sigma 14-24mm F2.8 DG HSM has a focal range of 14-24mm and 1.7X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 22.4 - 38.4mm.