The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Olympus ED 8-25mm F4 Pro 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. Olympus ED 8-25mm F4 Pro is the longer of the two lenses at 89mm. The Samyang 20mm F1.8 with a length of 88mm, is 1mm shorter. On the other hand, the Samyang 20mm F1.8 has a larger diameter of 83mm compared to the Olympus ED 8-25mm F4 Pro's 77mm 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 8-25mm F4 Pro weighs 411g, which means it is 86g (17%) lighter than the Samyang 20mm F1.8 which has a weight of 497g.
Filter Threads
The Olympus ED 8-25mm F4 Pro has a filter size of 72mm 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 72mm filters that we recommend you to consider for the Olympus ED 8-25mm F4 Pro:
And these are the 77mm filters that we recommend for the Samyang 20mm F1.8:
Lens Mounts
Both the Olympus ED 8-25mm F4 Pro 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
Olympus ED 8-25mm F4 Pro has a focal range of 8-25mm and
3.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
16-50mm 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.
