Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sigma APO 180mm F2.8 EX DG OS HSM is the longer of the two lenses at 204mm. The Tamron 180mm f3.5 LD Macro with a length of 166mm is 38mm shorter. Besides being longer, the Sigma APO 180mm F2.8 EX DG OS HSM also has a larger diameter of 95mm compared to Tamron 180mm f3.5 LD Macro's 85mm 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. Tamron 180mm f3.5 LD Macro weighs 920g, which means it is 720g (78%) lighter than the Sigma APO 180mm F2.8 EX DG OS HSM which has a weight of 1640g.
Below you can find the dimension and weight table of the 'Macro Prime Lenses in Sony Alpha Mount for size comparison purposes.
Macro Prime Lenses in Sony Alpha Mount for Size Comparison
Lens Mounts
Both Tamron 180mm f3.5 LD Macro and Sigma APO 180mm F2.8 EX DG OS HSM has the same Sony Alpha lens mount. Some of the latest released cameras that are compatible with the Sony Alpha lenses are Sony A99 II, Sony A68 and Sony A77 II.
Tamron 180mm f3.5 LD Macro is also available in Canon EF and Nikon F (FX) mounts.
Sigma APO 180mm F2.8 EX DG OS HSM is also available in Canon EF , Nikon F (FX) and Sigma SA mounts.
Focal Range