The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 14-24mm F2.8 DG HSM and the Tamron 15-30mm f2.8 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. Tamron 15-30mm f2.8 VC USD is the longer of the two lenses at 145mm. The Sigma 14-24mm F2.8 DG HSM with a length of 135mm, is 10mm shorter. Besides being longer, the Tamron 15-30mm f2.8 VC USD also has a larger diameter of 98mm compared to the Sigma 14-24mm F2.8 DG HSM's 96mm 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 15-30mm f2.8 VC USD weighs 1100g, 4% (50g) lighter than the Sigma 14-24mm F2.8 DG HSM's weight of 1150g.
Lens Mounts
The Sigma 14-24mm F2.8 DG HSM has the Sigma SA lens mount whereas the Tamron 15-30mm f2.8 VC USD has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Sigma SD1 Merrill, Sigma SD1 and for the Sigma SA Mount and Canon 1D X III, Canon 6D MII and Canon 5D MIV for the Canon EF Mount.
Sigma 14-24mm F2.8 DG HSM is also available in Canon EF and Nikon F (FX) mounts.
Tamron 15-30mm f2.8 VC USD is also available in Nikon F (FX) and Sony Alpha mounts.
Focal Range
Sigma 14-24mm F2.8 DG HSM has a focal range of 14-24mm and
1.7X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
21-36mm when used on a 35mm FF format camera.
On the other hand, the Tamron 15-30mm f2.8 VC USD has a focal range of 15-30mm and 2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 24 - 48mm.