The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Rokinon 14mm f2.8 and the Canon 17-40mm f4.0L USM 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. Canon 17-40mm f4.0L USM is the longer of the two lenses at 97mm. The Rokinon 14mm f2.8 with a length of 96mm, is 1mm shorter. On the other hand, the Rokinon 14mm f2.8 has a larger diameter of 87mm compared to the Canon 17-40mm f4.0L USM's 84mm 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. Canon 17-40mm f4.0L USM weighs 500g, 9% (52g) lighter than the Rokinon 14mm f2.8's weight of 552g.
Lens Mounts
The Rokinon 14mm f2.8 has the Samsung NX lens mount whereas the Canon 17-40mm f4.0L USM has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Samsung NX500, Samsung NX1 and Samsung NX3000 for the Samsung NX Mount and Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount.
Rokinon 14mm f2.8 is also available in the Canon EF , Nikon F (FX), Four Thirds, Pentax KAF and Sony Alpha mounts.
Focal Range
Rokinon 14mm f2.8 is a prime lens with fixed focal lenght of 14mm.
On the other hand, the Canon 17-40mm f4.0L USM has a focal range of 17-40mm and 2.4X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 27.2 - 64mm.
