The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 18-300mm F3.5-6.3 Di III-A and the Fujifilm XC 50-230mm F4.5-6.7 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. Tamron 18-300mm F3.5-6.3 Di III-A is the longer of the two lenses at 126mm. The Fujifilm XC 50-230mm F4.5-6.7 OIS with a length of 111mm, is 15mm shorter. Besides being longer, the Tamron 18-300mm F3.5-6.3 Di III-A also has a larger diameter of 76mm compared to the Fujifilm XC 50-230mm F4.5-6.7 OIS's 69mm 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 XC 50-230mm F4.5-6.7 OIS weighs 375g, 39% (245g) lighter than the Tamron 18-300mm F3.5-6.3 Di III-A's weight of 620g.
Below you can find the dimension and weight table of the SuperZoom Lenses in Fujifilm X Mount for size comparison purposes.
Super Telephoto Lenses in Fujifilm X Mount for Size Comparison
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Filter Threads
The Tamron 18-300mm F3.5-6.3 Di III-A has a filter size of 67mm whereas the Fujifilm XC 50-230mm F4.5-6.7 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 67mm filters that we recommend you to consider for the Tamron 18-300mm F3.5-6.3 Di III-A:
And these are the 58mm filters that we recommend for the Fujifilm XC 50-230mm F4.5-6.7 OIS:
Lens Mounts
Both the Tamron 18-300mm F3.5-6.3 Di III-A and the Fujifilm XC 50-230mm F4.5-6.7 OIS 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
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.
On the other hand, the Fujifilm XC 50-230mm F4.5-6.7 OIS has a focal range of 50-230mm and 4.6X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 75-345mm when used on a APS-C / DX format camera.