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 Olympus ED 7-14mm f4.0 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. Olympus ED 7-14mm f4.0 is the longer of the two lenses at 120mm. The Rokinon 14mm f2.8 with a length of 96mm, is 24mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 87mm.
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. Rokinon 14mm f2.8 weighs 552g, which means it is 228g (29%) lighter than the Olympus ED 7-14mm f4.0 which has a weight of 780g.
Lens Mounts
Both the Rokinon 14mm f2.8 and the Olympus ED 7-14mm f4.0 has the same Four Thirds lens mount. Some of the latest released cameras that are compatible with the Four Thirds lenses are Olympus E-5, Olympus E-600 and Olympus E-620.
Rokinon 14mm f2.8 is also available in the Canon EF , Nikon F (FX), Pentax KAF, Sony Alpha and Samsung NX mounts.
Focal Range
Rokinon 14mm f2.8 is a prime lens with fixed focal lenght of 14mm.
On the other hand, the Olympus ED 7-14mm f4.0 has a focal range of 7-14mm and 2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 14-28mm when used on a FourThirds format camera.
