The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron SP 70-200mm 2.8 Di VC USD G2 and the Canon 75-300mm f4.0-5.6 III for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Tamron SP 70-200mm 2.8 Di VC USD G2 is the longer of the two lenses at 194mm. The Canon 75-300mm f4.0-5.6 III with a length of 122mm, is 72mm shorter. Besides being longer, the Tamron SP 70-200mm 2.8 Di VC USD G2 also has a larger diameter of 88mm compared to the Canon 75-300mm f4.0-5.6 III's 71mm diameter.
The 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. Canon 75-300mm f4.0-5.6 III weighs 480g, 68% (1020g) lighter than the Tamron SP 70-200mm 2.8 Di VC USD G2's weight of 1500g.
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 the Tamron SP 70-200mm 2.8 Di VC USD G2 and the Canon 75-300mm f4.0-5.6 III 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 SP 70-200mm 2.8 Di VC USD G2 is also available in Nikon F (FX) mount.
Focal Range
Tamron SP 70-200mm 2.8 Di VC USD G2 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.
Canon 75-300mm f4.0-5.6 III has a focal range of 75-300mm and 4.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 120 - 480mm.