The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 85mm F1.4 EX DG HSM and the Sigma 70mm F2.8 EX DG Macro for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Sigma 70mm F2.8 EX DG Macro is the longer of the two lenses at 95mm. The Sigma 85mm F1.4 EX DG HSM with a length of 88mm, is 7mm shorter. On the other hand, the Sigma 85mm F1.4 EX DG HSM has a larger diameter of 86mm compared to the Sigma 70mm F2.8 EX DG Macro's 76mm diameter.
The 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. Sigma 70mm F2.8 EX DG Macro weighs 527g, 27% (198g) lighter than the Sigma 85mm F1.4 EX DG HSM's weight of 725g.
Lens Mounts
Both the Sigma 85mm F1.4 EX DG HSM and the Sigma 70mm F2.8 EX DG Macro has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Sigma 85mm F1.4 EX DG HSM is also available in Nikon F (FX) , Pentax KAF3, Sony Alpha and Sigma SA mounts.
Sigma 70mm F2.8 EX DG Macro is also available in Nikon F (FX) , Pentax KAF, Sony Alpha and Sigma SA mounts.
Focal Range
Sigma 85mm F1.4 EX DG HSM is a prime lens with fixed focal lenght of 85mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 136mm.
Sigma 70mm F2.8 EX DG Macro is a prime lens with fixed focal lenght of 70mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 112mm.