The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Olympus ED 8mm F1.8 Fisheye and the Rokinon 14mm f2.8 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. Rokinon 14mm f2.8 is the longer of the two lenses at 96mm. The Olympus ED 8mm F1.8 Fisheye with a length of 80mm, is 16mm shorter. Besides being longer, the Rokinon 14mm f2.8 also has a larger diameter of 87mm compared to the Olympus ED 8mm F1.8 Fisheye's 62mm 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. Olympus ED 8mm F1.8 Fisheye weighs 314g, which means it is 238g (43%) lighter than the Rokinon 14mm f2.8 which has a weight of 552g.
Lens Mounts
The Olympus ED 8mm F1.8 Fisheye has the Micro Four Thirds lens mount whereas the Rokinon 14mm f2.8 has the Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount and Olympus E-5, Olympus E-600 and Olympus E-620 for the Four Thirds Mount.
Rokinon 14mm f2.8 is also available in Canon EF , Nikon F (FX), Pentax KAF, Sony Alpha and Samsung NX mounts.
Focal Range
Olympus ED 8mm F1.8 Fisheye is a prime lens with fixed focal lenght of 8mm which has an effective (full-frame 35mm equivalent) focal range of
16mm when used on a FourThirds format camera.
On the other hand, the Rokinon 14mm f2.8 is a prime lens with fixed focal lenght of 14mm.
