The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 17-50mm f2.8 XR II VC LD and the Sigma 17-50mm F2.8 EX DC OS 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 17-50mm f2.8 XR II VC LD is the longer of the two lenses at 95mm. The Sigma 17-50mm F2.8 EX DC OS HSM with a length of 92mm is 3mm shorter. On the other hand, the Sigma 17-50mm F2.8 EX DC OS HSM has a larger diameter of 84mm compared to Tamron 17-50mm f2.8 XR II VC LD's 80mm diameter.
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 17-50mm F2.8 EX DC OS HSM weighs 565g, 0% (5g) lighter than the Tamron 17-50mm f2.8 XR II VC LD's weight of 570g.
Below you can find the dimension and weight table of the 'Standard Zoom Lenses in Nikon F (DX) Mount for size comparison purposes.
Standard Zoom Lenses in Nikon F (DX) Mount for Size Comparison
Lens Mounts
Both Tamron 17-50mm f2.8 XR II VC LD and Sigma 17-50mm F2.8 EX DC OS HSM has the same Nikon F (DX) lens mount. Some of the latest released cameras that are compatible with the Nikon F (DX) lenses are Nikon D3500, Nikon D7500 and Nikon D5600.
Tamron 17-50mm f2.8 XR II VC LD is also available in Canon EF mount.
Sigma 17-50mm F2.8 EX DC OS HSM is also available in Canon EF , Pentax KAF3, Sony Alpha and Sigma SA mounts.
Focal Range
Both lenses have the same focal range of 17-50mm and the fastest aperture of F2.8.