The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Fujifilm XF 16-80mm F4 R OIS WR and the Pentax 21mm F3.2 AL L 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 16-80mm F4 R OIS WR is the longer of the two lenses at 89mm. The Pentax 21mm F3.2 AL L with a length of 25mm, is 64mm shorter. Besides being longer, the Fujifilm XF 16-80mm F4 R OIS WR also has a larger diameter of 78mm compared to the Pentax 21mm F3.2 AL L's 63mm 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. Pentax 21mm F3.2 AL L weighs 134g, 69% (306g) lighter than the Fujifilm XF 16-80mm F4 R OIS WR's weight of 440g.
Filter Threads
The Fujifilm XF 16-80mm F4 R OIS WR has a filter size of 72mm whereas the Pentax 21mm F3.2 AL L has a 49mm 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 Fujifilm XF 16-80mm F4 R OIS WR:
And these are the 49mm filters that we recommend for the Pentax 21mm F3.2 AL L:
Lens Mounts
The Fujifilm XF 16-80mm F4 R OIS WR has the Fujifilm X lens mount whereas the Pentax 21mm F3.2 AL L 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.
Pentax 21mm F3.2 AL L is also available in Pentax KAF mount.
Focal Range
Fujifilm XF 16-80mm F4 R OIS WR has a focal range of 16-80mm and
5.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
24-120mm when used on a APS-C / DX format camera.
On the other hand, the Pentax 21mm F3.2 AL L 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.
