The type of photography that you are planning to use is an important decision factor. Here we have evaluated the OM SYSTEM 9-18mm f4.0-5.6 II and the Samyang 20mm 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. Samyang 20mm F1.8 is the longer of the two lenses at 88mm. The OM SYSTEM 9-18mm f4.0-5.6 II with a length of 49mm, is 39mm shorter. Besides being longer, the Samyang 20mm F1.8 also has a larger diameter of 83mm compared to the OM SYSTEM 9-18mm f4.0-5.6 II's 56mm 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. OM SYSTEM 9-18mm f4.0-5.6 II weighs 154g, which means it is 343g (69%) lighter than the Samyang 20mm F1.8 which has a weight of 497g.
Filter Threads
The OM SYSTEM 9-18mm f4.0-5.6 II has a filter size of 52mm whereas the Samyang 20mm F1.8 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 52mm filters that we recommend you to consider for the OM SYSTEM 9-18mm f4.0-5.6 II:
And these are the 77mm filters that we recommend for the Samyang 20mm F1.8:
Lens Mounts
Both the OM SYSTEM 9-18mm f4.0-5.6 II and the Samyang 20mm F1.8 has the same Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with the Micro Four Thirds lenses are OM System OM-3 Astro, OM System OM-5 II and OM System OM-3.
Samyang 20mm F1.8 is also available in Canon EF , Canon EF-M, Fujifilm X, Nikon F (FX), Pentax KAF, Samsung NX, Sony Alpha and Sony E mounts.
Focal Range
OM SYSTEM 9-18mm f4.0-5.6 II has a focal range of 9-18mm and
2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
18-36mm when used on a FourThirds format camera.
On the other hand, the Samyang 20mm F1.8 is a prime lens with fixed focal lenght of 20mm.
