The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Viltrox 75mm f1.2 AF and the Samyang 20mm F1.8 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. Viltrox 75mm f1.2 AF is the longer of the two lenses at 101mm. The Samyang 20mm F1.8 with a length of 88mm, is 13mm shorter. Besides being longer, the Viltrox 75mm f1.2 AF also has a larger diameter of 87mm compared to the Samyang 20mm F1.8's 83mm 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 20mm F1.8 weighs 497g, 25% (173g) lighter than the Viltrox 75mm f1.2 AF's weight of 670g.
Filter Threads
Both the Viltrox 75mm f1.2 AF and the Samyang 20mm F1.8 have the same Filter thread size of 77mm.
Below are links to the 77mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Viltrox 75mm f1.2 AF has the Sony E lens mount whereas the Samyang 20mm F1.8 has the Fujifilm X lens mount. Some of the latest released cameras that are compatible with these mounts are Sony ZV-E10 II, Sony A6700 and Sony FX30 for the Sony E Mount and Fujifilm X-T30 III, Fujifilm X-E5 and Fujifilm X-M5 for the Fujifilm X Mount.
Viltrox 75mm f1.2 AF is also available in the Fujifilm X and Nikon Z mounts.
Samyang 20mm F1.8 is also available in Canon EF , Canon EF-M, Micro Four Thirds, Nikon F (FX), Pentax KAF, Samsung NX, Sony Alpha and Sony E mounts.
Focal Range
Viltrox 75mm f1.2 AF is a prime lens with fixed focal lenght of 75mm which has an effective (full-frame 35mm equivalent) focal range of
112.5mm when used on a APS-C / DX format camera.
On the other hand, the Samyang 20mm F1.8 is a prime lens with fixed focal lenght of 20mm.
