The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Fujifilm XC 15-45mm F3.5-5.6 OIS PZ and the Pentax DA 20-40mm F2.8-4 ED DC 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. Pentax DA 20-40mm F2.8-4 ED DC WR is the longer of the two lenses at 69mm. The Fujifilm XC 15-45mm F3.5-5.6 OIS PZ with a length of 44mm, is 25mm shorter. Besides being longer, the Pentax DA 20-40mm F2.8-4 ED DC WR also has a larger diameter of 71mm compared to the Fujifilm XC 15-45mm F3.5-5.6 OIS PZ'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. Fujifilm XC 15-45mm F3.5-5.6 OIS PZ weighs 136g, which means it is 147g (51%) lighter than the Pentax DA 20-40mm F2.8-4 ED DC WR which has a weight of 283g.
Filter Threads
The Fujifilm XC 15-45mm F3.5-5.6 OIS PZ has a filter size of 52mm whereas the Pentax DA 20-40mm F2.8-4 ED DC WR has a 55mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 52mm filters that we recommend you to consider for the Fujifilm XC 15-45mm F3.5-5.6 OIS PZ:
And these are the 55mm filters that we recommend for the Pentax DA 20-40mm F2.8-4 ED DC WR:
Lens Mounts
The Fujifilm XC 15-45mm F3.5-5.6 OIS PZ has the Fujifilm X lens mount whereas the Pentax DA 20-40mm F2.8-4 ED DC WR has the Pentax KAF3 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 , and for the Pentax KAF3 Mount.
Focal Range
Fujifilm XC 15-45mm F3.5-5.6 OIS PZ has a focal range of 15-45mm and
3.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
22.5-67.5mm when used on a APS-C / DX format camera.
On the other hand, the Pentax DA 20-40mm F2.8-4 ED DC WR has a focal range of 20-40mm and 2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 30-60mm when used on a APS-C / DX format camera.
