The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang AF 75mm F1.8 FE 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. Samyang 85mm F1.4 is the longer of the two lenses at 75mm. The Samyang AF 75mm F1.8 FE with a length of 69mm, is 6mm shorter. Besides being longer, the Samyang 85mm F1.4 also has a larger diameter of 78mm compared to the Samyang AF 75mm F1.8 FE's 65mm 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 AF 75mm F1.8 FE weighs 230g, which means it is 309g (57%) lighter than the Samyang 85mm F1.4 which has a weight of 539g.
Filter Threads
The Samyang AF 75mm F1.8 FE has a filter size of 58mm 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 58mm filters that we recommend you to consider for the Samyang AF 75mm F1.8 FE:
And these are the 72mm filters that we recommend for the Samyang 85mm F1.4:
Lens Mounts
The Samyang AF 75mm F1.8 FE has the Sony E lens mount whereas the Samyang 85mm F1.4 has the Sony Alpha lens mount. Some of the latest released cameras that are compatible with these mounts are Sony A9 III, Sony A7C Mark II and Sony A7CR for the Sony E Mount and Sony A99 II, Sony A68 and Sony A77 II for the Sony Alpha Mount.
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
Samyang AF 75mm F1.8 FE is a prime lens with fixed focal lenght of 75mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
112.5mm.
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.