The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 16-300mm f3.5-6.3 II VC PZD and the Sigma 18-300 F3.5-6.3 DC OS 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 18-300 F3.5-6.3 DC OS HSM is the longer of the two lenses at 102mm. The Tamron 16-300mm f3.5-6.3 II VC PZD with a length of 100mm, is 2mm shorter. Besides being longer, the Sigma 18-300 F3.5-6.3 DC OS HSM also has a larger diameter of 79mm compared to the Tamron 16-300mm f3.5-6.3 II VC PZD's 75mm 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 16-300mm f3.5-6.3 II VC PZD weighs 540g, which means it is 45g (7%) lighter than the Sigma 18-300 F3.5-6.3 DC OS HSM which has a weight of 585g.
Below you can find the dimension and weight table of the SuperZoom Lenses in Nikon F (DX) Mount for size comparison purposes.
Super Telephoto Lenses in Nikon F (DX) Mount for Size Comparison
Filter Threads
The Tamron 16-300mm f3.5-6.3 II VC PZD has a filter size of 67mm whereas the Sigma 18-300 F3.5-6.3 DC OS HSM has a 72mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Tamron 16-300mm f3.5-6.3 II VC PZD:
And these are the 72mm filters that we recommend for the Sigma 18-300 F3.5-6.3 DC OS HSM:
Lens Mounts
Both the Tamron 16-300mm f3.5-6.3 II VC PZD and the Sigma 18-300 F3.5-6.3 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 16-300mm f3.5-6.3 II VC PZD is also available in Canon EF and Sony Alpha mounts.
Sigma 18-300 F3.5-6.3 DC OS HSM is also available in Canon EF , Pentax KAF3, Sigma SA and Sony Alpha mounts.
Focal Range
Tamron 16-300mm f3.5-6.3 II VC PZD has a focal range of 16-300mm and
18.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
24-450mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 18-300 F3.5-6.3 DC OS HSM has a focal range of 18-300mm and 16.7X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-450mm when used on a APS-C / DX format camera.