The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron AF 28-300mm f3.5-6.3 XR VC LD and the Sigma 18-125mm F3.8-5.6 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 18-125mm F3.8-5.6 DC OS HSM is the longer of the two lenses at 89mm. The Tamron AF 28-300mm f3.5-6.3 XR VC LD with a length of 78mm, is 11mm shorter. On the other hand, the Tamron AF 28-300mm f3.5-6.3 XR VC LD has a larger diameter of 99mm compared to the Sigma 18-125mm F3.8-5.6 DC OS HSM'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. Sigma 18-125mm F3.8-5.6 DC OS HSM weighs 490g, 11% (65g) lighter than the Tamron AF 28-300mm f3.5-6.3 XR VC LD's weight of 555g.
Filter Threads
Both the Tamron AF 28-300mm f3.5-6.3 XR VC LD and the Sigma 18-125mm F3.8-5.6 DC OS HSM have the same Filter thread size of 67mm.
Below are links to the 67mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Tamron AF 28-300mm f3.5-6.3 XR VC LD has the Nikon F (FX) lens mount whereas the Sigma 18-125mm F3.8-5.6 DC OS 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 AF 28-300mm f3.5-6.3 XR VC LD is also available in the Canon EF mount.
Sigma 18-125mm F3.8-5.6 DC OS HSM is also available in Canon EF and Sigma SA mounts.
Focal Range
Tamron AF 28-300mm f3.5-6.3 XR VC LD has a focal range of 28-300mm and
10.7X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
42 - 450mm.
On the other hand, the Sigma 18-125mm F3.8-5.6 DC OS HSM has a focal range of 18-125mm and 6.9X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-187.5mm when used on a APS-C / DX format camera.
