The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 50mm F1.4 AS UMC and the Samsung D-Xenon 18-55mm F3.5-5.6 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 50mm F1.4 AS UMC is the longer of the two lenses at 75mm. The Samsung D-Xenon 18-55mm F3.5-5.6 with a length of 68mm, is 7mm shorter. Besides being longer, the Samyang 50mm F1.4 AS UMC also has a larger diameter of 82mm compared to the Samsung D-Xenon 18-55mm F3.5-5.6's 69mm 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. Samsung D-Xenon 18-55mm F3.5-5.6 weighs 225g, 57% (310g) lighter than the Samyang 50mm F1.4 AS UMC's weight of 535g.
Filter Threads
The Samyang 50mm F1.4 AS UMC has a filter size of 77mm whereas the Samsung D-Xenon 18-55mm F3.5-5.6 has a 52mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Samyang 50mm F1.4 AS UMC:
And these are the 52mm filters that we recommend for the Samsung D-Xenon 18-55mm F3.5-5.6:
Lens Mounts
The Samyang 50mm F1.4 AS UMC has the Pentax KAF lens mount whereas the Samsung D-Xenon 18-55mm F3.5-5.6 has the Pentax KAF2 lens mount. Some of the latest released cameras that are compatible with these mounts are Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF Mount and , and for the Pentax KAF2 Mount.
Samyang 50mm F1.4 AS UMC is also available in the Canon EF , Nikon F (FX), Sony Alpha and Sony E mounts.
Focal Range
Samyang 50mm F1.4 AS UMC is a prime lens with fixed focal lenght of 50mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
75mm.
On the other hand, the Samsung D-Xenon 18-55mm F3.5-5.6 has a focal range of 18-55mm and 3.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-82.5mm when used on a APS-C / DX format camera.
