The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 24-70mm F2.8 DG OS HSM and the Tamron 24-70mm f2.8 VC USD for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Tamron 24-70mm f2.8 VC USD is the longer of the two lenses at 117mm. The Sigma 24-70mm F2.8 DG OS HSM with a length of 108mm is 9mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 88mm.
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 24-70mm f2.8 VC USD weighs 825g, 19% (195g) lighter than the Sigma 24-70mm F2.8 DG OS HSM's weight of 1020g.
Below you can find the dimension and weight table of the 'Standard Zoom Lenses in Canon EF Mount for size comparison purposes.
Standard Zoom Lenses in Canon EF Mount for Size Comparison
Both Sigma 24-70mm F2.8 DG OS HSM and Tamron 24-70mm f2.8 VC USD 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.
Sigma 24-70mm F2.8 DG OS HSM is also available in Sigma SA and Nikon F (FX) mounts.
Tamron 24-70mm f2.8 VC USD is also available in Nikon F (FX) and Sony Alpha mounts.
Both lenses have the same focal range of 24-70mm and the fastest aperture of F2.8.