The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang AF 12mm f2 RF-S and the Rokinon 14mm f2.8 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. Rokinon 14mm f2.8 is the longer of the two lenses at 96mm. The Samyang AF 12mm f2 RF-S with a length of 63mm, is 33mm shorter. Besides being longer, the Rokinon 14mm f2.8 also has a larger diameter of 87mm compared to the Samyang AF 12mm f2 RF-S's 70mm 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 12mm f2 RF-S weighs 213g, which means it is 339g (61%) lighter than the Rokinon 14mm f2.8 which has a weight of 552g.
Lens Mounts
The Samyang AF 12mm f2 RF-S has the Canon RF lens mount whereas the Rokinon 14mm f2.8 has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Canon R50 V, Canon R100 and Canon R50 for the Canon RF Mount and Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount.
Rokinon 14mm f2.8 is also available in Nikon F (FX) , Four Thirds, Pentax KAF, Sony Alpha and Samsung NX mounts.
Focal Range
Samyang AF 12mm f2 RF-S is a prime lens with fixed focal lenght of 12mm which has an effective (full-frame 35mm equivalent) focal range of
19.2mm when used on a APS-C / DX format camera.
On the other hand, the Rokinon 14mm f2.8 is a prime lens with fixed focal lenght of 14mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 22.4mm.
