The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Rokinon 85mm F1.4 and the Olympus ED 75mm f1.8 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 85mm F1.4 is the longer of the two lenses at 75mm. The Olympus ED 75mm f1.8 with a length of 69mm, is 6mm shorter. Besides being longer, the Rokinon 85mm F1.4 also has a larger diameter of 78mm compared to the Olympus ED 75mm f1.8'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. Olympus ED 75mm f1.8 weighs 305g, 43% (234g) lighter than the Rokinon 85mm F1.4's weight of 539g.
Filter Threads
The Rokinon 85mm F1.4 has a filter size of 72mm whereas the Olympus ED 75mm f1.8 has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 72mm filters that we recommend you to consider for the Rokinon 85mm F1.4:
And these are the 58mm filters that we recommend for the Olympus ED 75mm f1.8:
Lens Mounts
The Rokinon 85mm F1.4 has the Four Thirds lens mount whereas the Olympus ED 75mm f1.8 has the Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are Olympus E-5, Olympus E-600 and Olympus E-620 for the Four Thirds Mount and OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount.
Rokinon 85mm F1.4 is also available in the Canon EF , Pentax KAF, Sony Alpha, Samsung NX and Nikon F (FX) mounts.
Focal Range
Rokinon 85mm F1.4 is a prime lens with fixed focal lenght of 85mm.
On the other hand, the Olympus ED 75mm f1.8 is a prime lens with fixed focal lenght of 75mm which has an effective (full-frame 35mm equivalent) focal range of 150mm when used on a FourThirds format camera.
