The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 18-50mm F2.8 DC DN C 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. Sigma 18-50mm F2.8 DC DN C is the longer of the two lenses at 75mm. The Fujifilm 18-55mm F2.8-4 R LM OIS with a length of 70mm, is 5mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 65mm.
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Below you can find a scaled side-by-side image of Sigma 18-50mm F2.8 DC DN C and Fujifilm 18-55mm F2.8-4 R LM OIS to get a better idea of how their sizes compare in real life.
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. Sigma 18-50mm F2.8 DC DN C weighs 290g, which means it is 20g (6%) lighter than the Fujifilm 18-55mm F2.8-4 R LM OIS which has a weight of 310g.
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Filter Threads
The Sigma 18-50mm F2.8 DC DN C 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 Sigma 18-50mm F2.8 DC DN C:
And these are the 58mm filters that we recommend for the Fujifilm 18-55mm F2.8-4 R LM OIS:
Lens Mounts
The Sigma 18-50mm F2.8 DC DN C has the Sony E 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 Sony A6700, Sony FX30 and Sony ZV-E10 for the Sony E Mount and Fujifilm X-S20, Fujifilm X-T5 and Fujifilm X-H2 for the Fujifilm X Mount.
Sigma 18-50mm F2.8 DC DN C is also available in Leica L and Fujifilm X mounts.
Focal Range
Sigma 18-50mm F2.8 DC DN C 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.
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.