The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Fujifilm XF 18-120mm F4 and the Sigma 18-50mm F2.8 DC DN C 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 XF 18-120mm F4 is the longer of the two lenses at 124mm. The Sigma 18-50mm F2.8 DC DN C with a length of 75mm, is 49mm shorter. Besides being longer, the Fujifilm XF 18-120mm F4 also has a larger diameter of 77mm compared to the Sigma 18-50mm F2.8 DC DN C's 65mm diameter.
Below you can find a scaled side-by-side image of Fujifilm XF 18-120mm F4 and Sigma 18-50mm F2.8 DC DN C to get a better idea of how their sizes compare in real life.
Comparison image of the Fujifilm XF 18-120mm F4 and the Sigma 18-50mm F2.8 DC DN C Size and Weight 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, 36% (170g) lighter than the Fujifilm XF 18-120mm F4's weight of 460g.
Filter Threads
The Fujifilm XF 18-120mm F4 has a filter size of 72mm whereas the Sigma 18-50mm F2.8 DC DN C 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 72mm filters that we recommend you to consider for the Fujifilm XF 18-120mm F4:
And these are the 55mm filters that we recommend for the Sigma 18-50mm F2.8 DC DN C:
Lens Mounts
The Fujifilm XF 18-120mm F4 has the Fujifilm X lens mount whereas the Sigma 18-50mm F2.8 DC DN C has the Sony E 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 Sony ZV-E10 II , Sony A6700 and Sony FX30 for the Sony E Mount.
Leica L and Fujifilm X mounts.
Focal Range
Fujifilm XF 18-120mm F4 has a focal range of 18-120mm and
6.7X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
27-180mm when used on a APS-C / DX format camera.
On the other hand, the 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.
