The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony E 10-18mm F4 OSS 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. Sony E 10-18mm F4 OSS is the longer of the two lenses at 64mm. The Samyang 12mm f2.0 with a length of 59mm, is 5mm shorter. On the other hand, the Samyang 12mm f2.0 has a larger diameter of 73mm compared to the Sony E 10-18mm F4 OSS's 70mm 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. Sony E 10-18mm F4 OSS weighs 225g, which means it is 35g (13%) lighter than the Samyang 12mm f2.0 which has a weight of 260g.
Both the Sony E 10-18mm F4 OSS 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 FX30, Sony ZV-E10 and Sony A6600.
Samyang 12mm f2.0 is also available in Canon EF-M , Fujifilm X, Micro Four Thirds and Samsung NX mounts.
Sony E 10-18mm F4 OSS has a focal range of 10-18mm and 1.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 15-27mm when used on a APS-C / DX format camera. 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.