The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Rokinon 85mm F1.4 and the Samsung D-Xenon 100mm F2.8 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. Samsung D-Xenon 100mm F2.8 macro is the longer of the two lenses at 81mm. The Rokinon 85mm F1.4 with a length of 75mm, is 6mm shorter. On the other hand, the Rokinon 85mm F1.4 has a larger diameter of 78mm compared to the Samsung D-Xenon 100mm F2.8 macro's 68mm 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. Samsung D-Xenon 100mm F2.8 macro weighs 345g, 35% (194g) lighter than the Rokinon 85mm F1.4's weight of 539g.
Filter Threads
The Rokinon 85mm F1.4 has a filter size of 72mm whereas the Samsung D-Xenon 100mm F2.8 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 72mm filters that we recommend you to consider for the Rokinon 85mm F1.4:
And these are the 49mm filters that we recommend for the Samsung D-Xenon 100mm F2.8 macro:
Lens Mounts
The Rokinon 85mm F1.4 has the Pentax KAF lens mount whereas the Samsung D-Xenon 100mm F2.8 macro has the Pentax KAF2 lens mount. Some of the latest released cameras that are compatible with these mounts are Pentax K-3 III Monochrome, Pentax KF and Pentax K-3 III for the Pentax KAF Mount and , and for the Pentax KAF2 Mount.
Rokinon 85mm F1.4 is also available in Canon EF , Four Thirds, Sony Alpha, Samsung NX and Nikon F (FX) mounts.
Focal Range
Rokinon 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.
On the other hand, the Samsung D-Xenon 100mm F2.8 macro is a prime lens with fixed focal lenght of 100mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 150mm.