The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 70-200mm F2.8 EX DG OS HSM and the Tamron 70-210mm F4 Di VC USD 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 70-200mm F2.8 EX DG OS HSM is the longer of the two lenses at 197mm. The Tamron 70-210mm F4 Di VC USD with a length of 175mm, is 22mm shorter. Besides being longer, the Sigma 70-200mm F2.8 EX DG OS HSM also has a larger diameter of 86mm compared to the Tamron 70-210mm F4 Di VC USD's 76mm 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 70-210mm F4 Di VC USD weighs 859g, 39% (571g) lighter than the Sigma 70-200mm F2.8 EX DG OS HSM's weight of 1430g.
Below you can find the dimension and weight table of the Telephoto Zoom Lenses in Canon EF Mount for size comparison purposes.
Telephoto Lenses in Canon EF Mount for Size Comparison
Filter Threads
The Sigma 70-200mm F2.8 EX DG OS HSM has a filter size of 77mm whereas the Tamron 70-210mm F4 Di VC USD has a 67mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Sigma 70-200mm F2.8 EX DG OS HSM:
And these are the 67mm filters that we recommend for the Tamron 70-210mm F4 Di VC USD:
Lens Mounts
Both the Sigma 70-200mm F2.8 EX DG OS HSM and the Tamron 70-210mm F4 Di 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 70-200mm F2.8 EX DG OS HSM is also available in Nikon F (FX) , Pentax KAF3, Sony Alpha and Sigma SA mounts.
Tamron 70-210mm F4 Di VC USD is also available in Nikon F (FX) mount.
Focal Range
Sigma 70-200mm F2.8 EX DG OS HSM has a focal range of 70-200mm and
2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
112 - 320mm.
On the other hand, the Tamron 70-210mm F4 Di VC USD has a focal range of 70-210mm and 3.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 112 - 336mm.