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 Fujinon MKX 18-55mm T2.9 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 Fujinon MKX 18-55mm T2.9 is the longer of the two lenses at 207mm. The Sigma 18-50mm F2.8 DC DN C with a length of 77mm, is 130mm shorter. Besides being longer, the Fujifilm Fujinon MKX 18-55mm T2.9 also has a larger diameter of 87mm compared to the Sigma 18-50mm F2.8 DC DN C's 62mm 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. Sigma 18-50mm F2.8 DC DN C weighs 285g, which means it is 795g (73%) lighter than the Fujifilm Fujinon MKX 18-55mm T2.9 which has a weight of 1080g.
Below you can find the dimension and weight table of the Standard Zoom Lenses in Fujifilm X Mount for size comparison purposes.
Standard Lenses in Fujifilm X Mount for Size Comparison
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Filter Threads
The Sigma 18-50mm F2.8 DC DN C has a filter size of 55mm whereas the Fujifilm Fujinon MKX 18-55mm T2.9 has a 82mm 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 82mm filters that we recommend for the Fujifilm Fujinon MKX 18-55mm T2.9:
Lens Mounts
Both the Sigma 18-50mm F2.8 DC DN C and the Fujifilm Fujinon MKX 18-55mm T2.9 has the same Fujifilm X lens mount. Some of the latest released cameras that are compatible with the Fujifilm X lenses are Fujifilm X-S20, Fujifilm X-T5 and Fujifilm X-H2.
Sigma 18-50mm F2.8 DC DN C is also available in Leica L and Sony E 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 Fujinon MKX 18-55mm T2.9 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 35mm FF format camera.