The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Zeiss Loxia 85mm F2.4 and the Sigma 70mm F2.8 DG 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. Sigma 70mm F2.8 DG Macro is the longer of the two lenses at 106mm. The Zeiss Loxia 85mm F2.4 with a length of 95mm, is 11mm shorter. Besides being longer, the Sigma 70mm F2.8 DG Macro also has a larger diameter of 71mm compared to the Zeiss Loxia 85mm F2.4's 63mm 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 70mm F2.8 DG Macro weighs 515g, 13% (79g) lighter than the Zeiss Loxia 85mm F2.4's weight of 594g.
Filter Threads
The Zeiss Loxia 85mm F2.4 has a filter size of 52mm whereas the Sigma 70mm F2.8 DG Macro has a 49mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 52mm filters that we recommend you to consider for the Zeiss Loxia 85mm F2.4:
And these are the 49mm filters that we recommend for the Sigma 70mm F2.8 DG Macro:
Lens Mounts
Both the Zeiss Loxia 85mm F2.4 and the Sigma 70mm F2.8 DG Macro has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A9 III, Sony A7C Mark II and Sony A7CR.
Sigma 70mm F2.8 DG Macro is also available in Canon EF , Nikon F (FX) and Sigma SA mounts.
Focal Range
Zeiss Loxia 85mm F2.4 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 a 35mm (FF) equivalent of
127.5mm.
On the other hand, the Sigma 70mm F2.8 DG Macro is a prime lens with fixed focal lenght of 70mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 105mm.