The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Schneider PC-TS 4.5/90 and the Sigma 85mm F1.4 DG 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. Schneider PC-TS 4.5/90 is the longer of the two lenses at 139mm. The Sigma 85mm F1.4 DG HSM with a length of 126mm, is 13mm shorter. Besides being longer, the Schneider PC-TS 4.5/90 also has a larger diameter of 108mm compared to the Sigma 85mm F1.4 DG HSM's 95mm 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. Schneider PC-TS 4.5/90 weighs 1110g, which means it is 20g (1%) lighter than the Sigma 85mm F1.4 DG HSM which has a weight of 1130g.
Filter Threads
The Schneider PC-TS 4.5/90 has a filter size of 95mm whereas the Sigma 85mm F1.4 DG HSM has a 86mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 95mm filters that we recommend you to consider for the Schneider PC-TS 4.5/90:
And these are the 86mm filters that we recommend for the Sigma 85mm F1.4 DG HSM:
Lens Mounts
Both the Schneider PC-TS 4.5/90 and the Sigma 85mm F1.4 DG HSM 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.
Schneider PC-TS 4.5/90 is also available in Canon EF , Pentax KAF and Sony Alpha mounts.
Sigma 85mm F1.4 DG HSM is also available in Sigma SA and Canon EF mounts.
Focal Range
Schneider PC-TS 4.5/90 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 a 35mm (FF) equivalent of
135mm.
On the other hand, the 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 a 35mm (FF) equivalent of 127.5mm.