The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 18-300 F3.5-6.3 DC OS HSM and the Tamron 180mm f3.5 LD Macro 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. Tamron 180mm f3.5 LD Macro is the longer of the two lenses at 166mm. The Sigma 18-300 F3.5-6.3 DC OS HSM with a length of 102mm, is 64mm shorter. Besides being longer, the Tamron 180mm f3.5 LD Macro also has a larger diameter of 85mm compared to the Sigma 18-300 F3.5-6.3 DC OS HSM's 79mm 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 18-300 F3.5-6.3 DC OS HSM weighs 585g, which means it is 335g (36%) lighter than the Tamron 180mm f3.5 LD Macro which has a weight of 920g.
Filter Threads
Both the Sigma 18-300 F3.5-6.3 DC OS HSM and the Tamron 180mm f3.5 LD Macro have the same Filter thread size of 72mm.
Below are links to the 72mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Sigma 18-300 F3.5-6.3 DC OS HSM has the Nikon F (DX) lens mount whereas the Tamron 180mm f3.5 LD Macro has the Canon EF 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 Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount.
Sigma 18-300 F3.5-6.3 DC OS HSM is also available in the Canon EF , Pentax KAF3, Sigma SA and Sony Alpha mounts.
Tamron 180mm f3.5 LD Macro is also available in Nikon F (FX) and Sony Alpha mounts.
Focal Range
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.
On the other hand, the Tamron 180mm f3.5 LD Macro is a prime lens with fixed focal lenght of 180mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 288mm.
