The type of photography that you are planning to use is an important decision factor. Here we have evaluated the HD Pentax-FA 31mm F1.8 Ltd and the Fujifilm XF 35mm F2 R 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. HD Pentax-FA 31mm F1.8 Ltd is the longer of the two lenses at 69mm. The Fujifilm XF 35mm F2 R WR with a length of 46mm, is 23mm shorter. Besides being longer, the HD Pentax-FA 31mm F1.8 Ltd also has a larger diameter of 65mm compared to the Fujifilm XF 35mm F2 R WR's 60mm diameter.
Below you can find a scaled side-by-side image of HD Pentax-FA 31mm F1.8 Ltd and Fujifilm XF 35mm F2 R WR to get a better idea of how their sizes compare in real life.
Comparison image of the HD Pentax-FA 31mm F1.8 Ltd and the Fujifilm XF 35mm F2 R WR 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. Fujifilm XF 35mm F2 R WR weighs 170g, 50% (171g) lighter than the HD Pentax-FA 31mm F1.8 Ltd's weight of 341g.
Filter Threads
The HD Pentax-FA 31mm F1.8 Ltd has a filter size of 58mm whereas the Fujifilm XF 35mm F2 R WR has a 43mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 58mm filters that we recommend you to consider for the HD Pentax-FA 31mm F1.8 Ltd:
And these are the 43mm filters that we recommend for the Fujifilm XF 35mm F2 R WR:
Lens Mounts
The HD Pentax-FA 31mm F1.8 Ltd has the Pentax KAF lens mount whereas the Fujifilm XF 35mm F2 R WR has the Fujifilm X 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 Fujifilm X-T30 III , Fujifilm X-E5 and Fujifilm X-M5 for the Fujifilm X Mount.
Focal Range
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 .
On the other hand, the Fujifilm XF 35mm F2 R WR is a prime lens with fixed focal lenght of 35mm which has an effective (full-frame 35mm equivalent) focal range of 52.5mm when used on a APS-C / DX format camera.
