The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samsung 12-24mm F4-5.6 ED and the Rokinon 24mm f1.4 for their suitability to various photography scenarios:
Size and Weight Comparison
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. Samsung 12-24mm F4-5.6 ED weighs 208g, which means it is 372g (64%) lighter than the Rokinon 24mm f1.4 which has a weight of 580g.
Filter Threads
The Samsung 12-24mm F4-5.6 ED has a filter size of 58mm whereas the Rokinon 24mm f1.4 has a 77mm 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 Samsung 12-24mm F4-5.6 ED:
And these are the 77mm filters that we recommend for the Rokinon 24mm f1.4:
Lens Mounts
Both the Samsung 12-24mm F4-5.6 ED and the Rokinon 24mm f1.4 has the same Samsung NX lens mount. Some of the latest released cameras that are compatible with the Samsung NX lenses are Samsung NX1, Samsung NX3000 and Samsung NX30.
Rokinon 24mm f1.4 is also available in Canon EF , Nikon F (FX), Four Thirds, Pentax KAF and Sony Alpha mounts.
Focal Range
Samsung 12-24mm F4-5.6 ED has a focal range of 19-37mm and
1.9X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
28.5-55.5mm when used on a APS-C / DX format camera.
On the other hand, the Rokinon 24mm f1.4 is a prime lens with fixed focal lenght of 24mm.