The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 21mm F1.4 ED AS UMC CS and the Fujifilm XF 23mm F1.4 R LM WR 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. Fujifilm XF 23mm F1.4 R LM WR is the longer of the two lenses at 78mm. The Samyang 21mm F1.4 ED AS UMC CS with a length of 68mm, is 10mm shorter. Besides being longer, the Fujifilm XF 23mm F1.4 R LM WR also has a larger diameter of 67mm compared to the Samyang 21mm F1.4 ED AS UMC CS's 64mm diameter.
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Below you can find a scaled side-by-side image of Samyang 21mm F1.4 ED AS UMC CS and Fujifilm XF 23mm F1.4 R LM WR to get a better idea of how their sizes compare in real life.
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. Samyang 21mm F1.4 ED AS UMC CS weighs 275g, which means it is 100g (26%) lighter than the Fujifilm XF 23mm F1.4 R LM WR which has a weight of 375g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Fujifilm X Mount for size comparison purposes.
Wideangle Lenses in Fujifilm X Mount for Size Comparison
Filter Threads
Both the Samyang 21mm F1.4 ED AS UMC CS and the Fujifilm XF 23mm F1.4 R LM WR have the same Filter thread size of 58mm.
Below are links to the 58mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Samyang 21mm F1.4 ED AS UMC CS and the Fujifilm XF 23mm F1.4 R LM WR has the same Fujifilm X lens mount. Some of the latest released cameras that are compatible with the Fujifilm X lenses are Fujifilm X-S20, Fujifilm X-T5 and Fujifilm X-H2.
Samyang 21mm F1.4 ED AS UMC CS is also available in Canon EF-M , Micro Four Thirds and Sony E mounts.
Focal Range
Samyang 21mm F1.4 ED AS UMC CS is a prime lens with fixed focal lenght of 21mm which has an effective (full-frame 35mm equivalent) focal range of
31.5mm when used on a APS-C / DX format camera.
On the other hand, the Fujifilm XF 23mm F1.4 R LM WR is a prime lens with fixed focal lenght of 23mm which has an effective (full-frame 35mm equivalent) focal range of 34.5mm when used on a APS-C / DX format camera.