The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 70-300mm f4-5.6 VC USD and the Sigma 70-300mm F4-5.6 DG OS 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 70-300mm f4-5.6 VC USD is the longer of the two lenses at 143mm. The Sigma 70-300mm F4-5.6 DG OS with a length of 126mm is 17mm shorter. Besides being longer, the Tamron 70-300mm f4-5.6 VC USD also has a larger diameter of 82mm compared to Sigma 70-300mm F4-5.6 DG OS's 77mm diameter.
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. Sigma 70-300mm F4-5.6 DG OS weighs 610g, 20% (155g) lighter than the Tamron 70-300mm f4-5.6 VC USD's weight of 765g.
Below you can find the dimension and weight table of the 'Telephoto Zoom Lenses in Canon EF Mount for size comparison purposes.
Telephoto Zoom Lenses in Canon EF Mount for Size Comparison
Lens Mounts
Both Tamron 70-300mm f4-5.6 VC USD and Sigma 70-300mm F4-5.6 DG OS 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 70-300mm f4-5.6 VC USD is also available in Nikon F (FX) mount.
Sigma 70-300mm F4-5.6 DG OS is also available in Nikon F (FX) , Pentax KAF3, Sony Alpha and Sigma SA mounts.
Focal Range
Both lenses have the same focal range of 70-300mm and the fastest aperture of F4.0 - F5.6.