The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Fujifilm XF 23mm F1.4 R LM WR and the HD Pentax-FA 31mm F1.8 Ltd 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 HD Pentax-FA 31mm F1.8 Ltd with a length of 69mm, is 9mm shorter. Besides being longer, the Fujifilm XF 23mm F1.4 R LM WR also has a larger diameter of 67mm compared to the HD Pentax-FA 31mm F1.8 Ltd's 65mm diameter.
Below you can find a scaled side-by-side image of Fujifilm XF 23mm F1.4 R LM WR and HD Pentax-FA 31mm F1.8 Ltd to get a better idea of how their sizes compare in real life.
Comparison image of the Fujifilm XF 23mm F1.4 R LM WR and the HD Pentax-FA 31mm F1.8 Ltd Size and Weight 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. HD Pentax-FA 31mm F1.8 Ltd weighs 341g, 9% (34g) lighter than the Fujifilm XF 23mm F1.4 R LM WR's weight of 375g.
Filter Threads
Both the Fujifilm XF 23mm F1.4 R LM WR and the HD Pentax-FA 31mm F1.8 Ltd 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
The Fujifilm XF 23mm F1.4 R LM WR has the Fujifilm X lens mount whereas the HD Pentax-FA 31mm F1.8 Ltd has the Pentax KAF lens mount . Some of the latest released cameras that are compatible with these mounts are Fujifilm X-T30 III , Fujifilm X-E5 and Fujifilm X-M5 for the Fujifilm X Mount and Pentax K-3 III Mono , Pentax KF and Pentax K-3 III for the Pentax KAF Mount.
Focal Range
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.
On the other hand, the HD Pentax-FA 31mm F1.8 Ltd is a prime lens with fixed focal lenght of 31mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 46.5mm .
