The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony 135mm F2.8 (T4.5) STF 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. Sony 135mm F2.8 (T4.5) STF is the longer of the two lenses at 99mm. The Samyang 85mm F1.4 with a length of 75mm, is 24mm shorter. Besides being longer, the Sony 135mm F2.8 (T4.5) STF also has a larger diameter of 80mm 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, 26% (191g) lighter than the Sony 135mm F2.8 (T4.5) STF's weight of 730g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Sony Alpha Mount for size comparison purposes.
Telephoto Lenses in Sony Alpha Mount for Size Comparison
Filter Threads
Both the Sony 135mm F2.8 (T4.5) STF and the Samyang 85mm F1.4 have the same Filter thread size of 72mm.
Below are links to the 72mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Sony 135mm F2.8 (T4.5) STF and the Samyang 85mm F1.4 has the same Sony Alpha lens mount. Some of the latest released cameras that are compatible with the Sony Alpha lenses are Sony A99 II, Sony A68 and Sony A77 II.
Samyang 85mm F1.4 is also available in Canon EF , Nikon F (FX), Four Thirds, Pentax KAF, Sony E and Samsung NX mounts.
Focal Range
Sony 135mm F2.8 (T4.5) STF is a prime lens with fixed focal lenght of 135mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
202.5mm.
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.
