The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 15-30mm f2.8 VC USD and the Sigma 18-35mm F1.8 DC HSM 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 15-30mm f2.8 VC USD is the longer of the two lenses at 145mm. The Sigma 18-35mm F1.8 DC HSM with a length of 121mm is 24mm shorter. Besides being longer, the Tamron 15-30mm f2.8 VC USD also has a larger diameter of 98mm compared to Sigma 18-35mm F1.8 DC HSM's 78mm diameter.
Below you can find the scaled side by side image of Tamron 15-30mm f2.8 VC USD and Sigma 18-35mm F1.8 DC HSM to get a better idea of how their size compare in real life.
Comparison image of Tamron 15-30mm f2.8 VC USD and Sigma 18-35mm F1.8 DC HSM Size and Weight 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 18-35mm F1.8 DC HSM weighs 810g, 26% (290g) lighter than the Tamron 15-30mm f2.8 VC USD's weight of 1100g.
Lens Mounts
Both Tamron 15-30mm f2.8 VC USD has the Nikon F (FX) lens mount whereas the Sigma 18-35mm F1.8 DC HSM has the Nikon F (DX) lens mount. Some of the latest released cameras that are compatible with these mounts are Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount and Nikon D3500, Nikon D7500 and Nikon D5600 for the Nikon F (DX) Mount.
Tamron 15-30mm f2.8 VC USD is also available in Canon EF and Sony Alpha mounts.
Sigma 18-35mm F1.8 DC HSM is also available in Canon EF , Pentax KAF, Sony Alpha and Sigma SA mounts.
Focal Range
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 1.5x crop, it provides an 35mm (FF) equivalent of 22.5 - 45mm.
Sigma 18-35mm F1.8 DC HSM has a focal range of 18-35mm and 1.9X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-52.5mm when used on a APS-C / DX format camera.