The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tokina atx-m 85mm F1.8 FE and the Sigma 105mm F2.8 EX DG OS HSM 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 105mm F2.8 EX DG OS HSM is the longer of the two lenses at 127mm. The Tokina atx-m 85mm F1.8 FE with a length of 80mm, is 47mm shorter. On the other hand, the Tokina atx-m 85mm F1.8 FE has a larger diameter of 93mm compared to the Sigma 105mm F2.8 EX DG OS HSM's 78mm 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. Tokina atx-m 85mm F1.8 FE weighs 645g, which means it is 81g (11%) lighter than the Sigma 105mm F2.8 EX DG OS HSM which has a weight of 726g.
Filter Threads
The Tokina atx-m 85mm F1.8 FE has a filter size of 72mm whereas the Sigma 105mm F2.8 EX DG OS HSM has a 62mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 72mm filters that we recommend you to consider for the Tokina atx-m 85mm F1.8 FE:
And these are the 62mm filters that we recommend for the Sigma 105mm F2.8 EX DG OS HSM:
Lens Mounts
The Tokina atx-m 85mm F1.8 FE has the Sony E lens mount whereas the Sigma 105mm F2.8 EX DG OS HSM has the Sigma SA lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount and Sigma Quattro, Sigma Quattro H and Sigma SD1 Merrill for the Sigma SA Mount.
Sigma 105mm F2.8 EX DG OS HSM is also available in Canon EF and Nikon F (FX) mounts.
Focal Range
Tokina atx-m 85mm F1.8 FE 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 105mm F2.8 EX DG OS HSM is a prime lens with fixed focal lenght of 105mm.
