The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 85mm F1.4 DG HSM and the Tamron 90mm f2.8 Macro for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sigma 85mm F1.4 DG HSM is the longer of the two lenses at 126mm. The Tamron 90mm f2.8 Macro with a length of 97mm is 29mm shorter. Besides being longer, the Sigma 85mm F1.4 DG HSM also has a larger diameter of 95mm compared to Tamron 90mm f2.8 Macro's 72mm 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 90mm f2.8 Macro weighs 405g, 64% (725g) lighter than the Sigma 85mm F1.4 DG HSM's weight of 1130g.
Both Sigma 85mm F1.4 DG HSM and Tamron 90mm f2.8 Macro has the same Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with the Nikon F (FX) lenses are Nikon D6, Nikon D780 and Nikon D3500.
Sigma 85mm F1.4 DG HSM is also available in Sigma SA and Canon EF mounts.
Tamron 90mm f2.8 Macro is also available in Canon EF , Sony Alpha and Pentax KAF mounts.
Sigma 85mm F1.4 DG HSM is a prime lens with fixed focal lenght of 85mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 127.5mm.
Tamron 90mm f2.8 Macro is a prime lens with fixed focal lenght of 90mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 135mm.