The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 18-270mm f3.5-6.3 II VC PZD and the Sigma 8-16mm F4.5-5.6 DC 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. Sigma 8-16mm F4.5-5.6 DC HSM is the longer of the two lenses at 106mm. The Tamron 18-270mm f3.5-6.3 II VC PZD with a length of 88mm, is 18mm shorter. Besides being longer, the Sigma 8-16mm F4.5-5.6 DC HSM also has a larger diameter of 75mm compared to the Tamron 18-270mm f3.5-6.3 II VC PZD's 74mm 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 18-270mm f3.5-6.3 II VC PZD weighs 450g, which means it is 105g (18%) lighter than the Sigma 8-16mm F4.5-5.6 DC HSM which has a weight of 555g.
Lens Mounts
The Tamron 18-270mm f3.5-6.3 II VC PZD has the Nikon F (DX) lens mount whereas the Sigma 8-16mm F4.5-5.6 DC HSM has the Sigma SA lens mount. Some of the latest released cameras that are compatible with these mounts are Nikon D3500, Nikon D7500 and Nikon D5600 for the Nikon F (DX) Mount and Sigma SD1 Merrill, Sigma SD1 and for the Sigma SA Mount.
Tamron 18-270mm f3.5-6.3 II VC PZD is also available in the Canon EF mount.
Sigma 8-16mm F4.5-5.6 DC HSM is also available in Canon EF , Pentax KAF3, Sony Alpha and Nikon F (DX) mounts.
Focal Range
Tamron 18-270mm f3.5-6.3 II VC PZD has a focal range of 18-270mm and
15.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
27-405mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 8-16mm F4.5-5.6 DC HSM has a focal range of 8-16mm and 2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 12-24mm when used on a APS-C / DX format camera.
