The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 14mm F2.8 and the Samyang 12mm f2.0 for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Samyang 14mm F2.8 is the longer of the two lenses at 96mm. The Samyang 12mm f2.0 with a length of 59mm, is 37mm shorter. Besides being longer, the Samyang 14mm F2.8 also has a larger diameter of 87mm compared to the Samyang 12mm f2.0's 73mm diameter.
The weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Samyang 12mm f2.0 weighs 260g, 52% (292g) lighter than the Samyang 14mm F2.8's weight of 552g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Sony E Mount for size comparison purposes.
Wideangle Prime Lenses in Sony E Mount for Size Comparison
Both the Samyang 14mm F2.8 and the Samyang 12mm f2.0 has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony ZV-E1, Sony A7R V and Sony FX30.
Samyang 14mm F2.8 is also available in Canon EF , Nikon F (FX), Four Thirds, Pentax KAF, Sony Alpha and Samsung NX mounts.
Samyang 12mm f2.0 is also available in Canon EF-M , Fujifilm X, Micro Four Thirds and Samsung NX mounts.
Samyang 14mm F2.8 is a prime lens with fixed focal lenght of 14mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 21mm.
Samyang 12mm f2.0 is a prime lens with fixed focal lenght of 12mm which has an effective (full-frame 35mm equivalent) focal range of 18mm when used on a APS-C / DX format camera.