The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 12mm f2.0 and the Carl Zeiss Touit 2.8/12 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. Carl Zeiss Touit 2.8/12 is the longer of the two lenses at 86mm. The Samyang 12mm f2.0 with a length of 59mm, is 27mm shorter. Besides being longer, the Carl Zeiss Touit 2.8/12 also has a larger diameter of 82mm 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, which means it is 10g (3%) lighter than the Carl Zeiss Touit 2.8/12 which has a weight of 270g.
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
Lens Mounts
Both the Samyang 12mm f2.0 and the Carl Zeiss Touit 2.8/12 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.
Carl Zeiss Touit 2.8/12 is also available in Fujifilm X mount.
Focal Range
Both lenses have the same focal range of 12mm but while Samyang 12mm f2.0 has the fastest aperture of F2.0, the Carl Zeiss Touit 2.8/12's widest aperture value is F2.8.