The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 24-70mm F2.8 Di VC USD G2 and the Tamron AF 28-80mm f3.5-5.6 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 24-70mm F2.8 Di VC USD G2 is the longer of the two lenses at 111mm. The Tamron AF 28-80mm f3.5-5.6 with a length of 70mm, is 41mm shorter. Besides being longer, the Tamron 24-70mm F2.8 Di VC USD G2 also has a larger diameter of 88mm compared to the Tamron AF 28-80mm f3.5-5.6's 72mm 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. Tamron AF 28-80mm f3.5-5.6 weighs 237g, 73% (668g) lighter than the Tamron 24-70mm F2.8 Di VC USD G2's weight of 905g.
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
Lens Mounts
Both the Tamron 24-70mm F2.8 Di VC USD G2 and the Tamron AF 28-80mm f3.5-5.6 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 24-70mm F2.8 Di VC USD G2 is also available in Nikon F (FX) mount.
Tamron AF 28-80mm f3.5-5.6 is also available in Nikon F (FX) , Sony Alpha and Pentax KAF mounts.
Focal Range
Tamron 24-70mm F2.8 Di VC USD G2 has a focal range of 24-70mm 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 38.4 - 112mm.
Tamron AF 28-80mm f3.5-5.6 has a focal range of 28-80mm 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 44.8 - 128mm.