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 Tamron 18-300mm F3.5-6.3 Di III-A 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. Tamron 18-300mm F3.5-6.3 Di III-A is the longer of the two lenses at 126mm. The Fujifilm XF 18-120mm F4 with a length of 124mm, is 2mm shorter. On the other hand, the Fujifilm XF 18-120mm F4 has a larger diameter of 77mm compared to the Tamron 18-300mm F3.5-6.3 Di III-A's 76mm diameter.
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Below you can find a scaled side-by-side image of Fujifilm XF 18-120mm F4 and Tamron 18-300mm F3.5-6.3 Di III-A 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. Fujifilm XF 18-120mm F4 weighs 460g, which means it is 160g (25%) lighter than the Tamron 18-300mm F3.5-6.3 Di III-A which has a weight of 620g.
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Filter Threads
The Fujifilm XF 18-120mm F4 has a filter size of 72mm whereas the Tamron 18-300mm F3.5-6.3 Di III-A 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 72mm filters that we recommend you to consider for the Fujifilm XF 18-120mm F4:
And these are the 67mm filters that we recommend for the Tamron 18-300mm F3.5-6.3 Di III-A:
Lens Mounts
Both the Fujifilm XF 18-120mm F4 and the Tamron 18-300mm F3.5-6.3 Di III-A 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.
Tamron 18-300mm F3.5-6.3 Di III-A is also available in Sony E mount.
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 Tamron 18-300mm F3.5-6.3 Di III-A has a focal range of 18-300mm and 16.7X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-450mm when used on a APS-C / DX format camera.