The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 21mm F1.4 ED AS UMC CS and the Samyang 12mm f2.0 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. Samyang 21mm F1.4 ED AS UMC CS is the longer of the two lenses at 68mm. The Samyang 12mm f2.0 with a length of 59mm, is 9mm shorter. On the other hand, the Samyang 12mm f2.0 has a larger diameter of 73mm compared to the Samyang 21mm F1.4 ED AS UMC CS's 64mm 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 12mm f2.0 weighs 260g, 5% (15g) lighter than the Samyang 21mm F1.4 ED AS UMC CS's weight of 275g.
Filter Threads
The Samyang 21mm F1.4 ED AS UMC CS has a filter size of 58mm whereas the Samyang 12mm f2.0 has a 67mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 58mm filters that we recommend you to consider for the Samyang 21mm F1.4 ED AS UMC CS:
And these are the 67mm filters that we recommend for the Samyang 12mm f2.0:
Lens Mounts
Both the Samyang 21mm F1.4 ED AS UMC CS and the Samyang 12mm f2.0 has the same Canon EF-M lens mount. Some of the latest released cameras that are compatible with the Canon EF-M lenses are Canon M50 II, Canon M200 and Canon M6 MII.
Samyang 21mm F1.4 ED AS UMC CS is also available in the Fujifilm X , Micro Four Thirds and Sony E mounts.
Samyang 12mm f2.0 is also available in Fujifilm X , Micro Four Thirds, Sony E and Samsung NX mounts.
Focal Range
Samyang 21mm F1.4 ED AS UMC CS is a prime lens with fixed focal lenght of 21mm which has an effective (full-frame 35mm equivalent) focal range of
33.6mm when used on a APS-C / DX format camera.
On the other hand, the 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.
