The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax DA 20-40mm F2.8-4 ED DC WR and the Fujifilm 18-55mm F2.8-4 R LM OIS 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 18-55mm F2.8-4 R LM OIS is the longer of the two lenses at 70mm. The Pentax DA 20-40mm F2.8-4 ED DC WR with a length of 69mm, is 1mm shorter. On the other hand, the Pentax DA 20-40mm F2.8-4 ED DC WR has a larger diameter of 71mm compared to the Fujifilm 18-55mm F2.8-4 R LM OIS's 65mm 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 DA 20-40mm F2.8-4 ED DC WR weighs 283g, which means it is 27g (8%) lighter than the Fujifilm 18-55mm F2.8-4 R LM OIS which has a weight of 310g.
Filter Threads
The Pentax DA 20-40mm F2.8-4 ED DC WR has a filter size of 55mm whereas the Fujifilm 18-55mm F2.8-4 R LM OIS has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 55mm filters that we recommend you to consider for the Pentax DA 20-40mm F2.8-4 ED DC WR:
And these are the 58mm filters that we recommend for the Fujifilm 18-55mm F2.8-4 R LM OIS:
Lens Mounts
The Pentax DA 20-40mm F2.8-4 ED DC WR has the Pentax KAF3 lens mount whereas the Fujifilm 18-55mm F2.8-4 R LM OIS has the Fujifilm X lens mount. Some of the latest released cameras that are compatible with these mounts are , and for the Pentax KAF3 Mount and Fujifilm X-T30 III, Fujifilm X-E5 and Fujifilm X-M5 for the Fujifilm X Mount.
Focal Range
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.
On the other hand, the Fujifilm 18-55mm F2.8-4 R LM OIS has a focal range of 18-55mm and 3.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-82.5mm when used on a APS-C / DX format camera.
