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 Sigma 18-50mm F2.8-4.5 DC OS HSM 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. Sigma 18-50mm F2.8-4.5 DC OS HSM is the longer of the two lenses at 89mm. The Fujifilm XF 23mm F1.4 R LM WR with a length of 78mm, is 11mm shorter. Besides being longer, the Sigma 18-50mm F2.8-4.5 DC OS HSM also has a larger diameter of 74mm compared to the Fujifilm XF 23mm F1.4 R LM WR's 67mm 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 XF 23mm F1.4 R LM WR weighs 375g, which means it is 20g (5%) lighter than the Sigma 18-50mm F2.8-4.5 DC OS HSM which has a weight of 395g.
Filter Threads
The Fujifilm XF 23mm F1.4 R LM WR has a filter size of 58mm whereas the Sigma 18-50mm F2.8-4.5 DC OS HSM has a 67mm 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 Fujifilm XF 23mm F1.4 R LM WR:
And these are the 67mm filters that we recommend for the Sigma 18-50mm F2.8-4.5 DC OS HSM:
Lens Mounts
The Fujifilm XF 23mm F1.4 R LM WR has the Fujifilm X lens mount whereas the Sigma 18-50mm F2.8-4.5 DC OS HSM 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.
Sigma 18-50mm F2.8-4.5 DC OS HSM is also available in Canon EF , Sony Alpha, Sigma SA and Nikon F (DX) mounts.
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 Sigma 18-50mm F2.8-4.5 DC OS HSM has a focal range of 18-50mm and 2.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-75mm when used on a APS-C / DX format camera.
