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 Samyang 85mm F1.4 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 Samyang 85mm F1.4 with a length of 75mm, is 64mm shorter. Besides being longer, the Schneider PC-TS 4.5/90 also has a larger diameter of 108mm compared to the Samyang 85mm F1.4'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. Samyang 85mm F1.4 weighs 539g, 51% (571g) lighter than the Schneider PC-TS 4.5/90's weight of 1110g.
Filter Threads
The Schneider PC-TS 4.5/90 has a filter size of 95mm whereas the Samyang 85mm F1.4 has a 72mm 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 72mm filters that we recommend for the Samyang 85mm F1.4:
Lens Mounts
Both the Schneider PC-TS 4.5/90 and the Samyang 85mm F1.4 has the same Pentax KAF lens mount. Some of the latest released cameras that are compatible with the Pentax KAF lenses are Pentax K-3 III Monochrome, Pentax KF and Pentax K-3 III.
Schneider PC-TS 4.5/90 is also available in Canon EF , Nikon F (FX) and Sony Alpha mounts.
Samyang 85mm F1.4 is also available in Canon EF , Nikon F (FX), Four Thirds, Sony Alpha, Sony E and Samsung NX 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 Samyang 85mm F1.4 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.