The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron SP 15-30mm F2.8 Di VC USD G2 and the Sigma 12-24mm F4 DG HSM 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 SP 15-30mm F2.8 Di VC USD G2 is the longer of the two lenses at 145mm. The Sigma 12-24mm F4 DG HSM with a length of 132mm, is 13mm shorter. On the other hand, the Sigma 12-24mm F4 DG HSM has a larger diameter of 101mm compared to the Tamron SP 15-30mm F2.8 Di VC USD G2's 98mm 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 SP 15-30mm F2.8 Di VC USD G2 weighs 1110g, which means it is 41g (3%) lighter than the Sigma 12-24mm F4 DG HSM which has a weight of 1151g.
Below you can find the dimension and weight table of the Wideangle Zoom Lenses in Nikon F (FX) Mount for size comparison purposes.
Ultra-Wideangle Lenses in Nikon F (FX) Mount for Size Comparison
Lens Mounts
Both the Tamron SP 15-30mm F2.8 Di VC USD G2 and the Sigma 12-24mm F4 DG HSM has the same Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with the Nikon F (FX) lenses are Nikon D6, Nikon D780 and Nikon D3500.
Tamron SP 15-30mm F2.8 Di VC USD G2 is also available in Canon EF mount.
Sigma 12-24mm F4 DG HSM is also available in Sigma SA and Canon EF mounts.
Focal Range
Tamron SP 15-30mm F2.8 Di VC USD G2 has a focal range of 15-30mm and
2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
22.5 - 45mm.
On the other hand, the Sigma 12-24mm F4 DG HSM has a focal range of 12-24mm and 2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 18 - 36mm.