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 XF 70-300 F4-5.6 R 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 70-300 F4-5.6 R is the longer of the two lenses at 133mm. The Tamron 18-300mm F3.5-6.3 Di III-A with a length of 126mm, is 7mm shorter. On the other hand, the Tamron 18-300mm F3.5-6.3 Di III-A has a larger diameter of 76mm compared to the Fujifilm XF 70-300 F4-5.6 R's 75mm diameter.
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Below you can find a scaled side-by-side image of Tamron 18-300mm F3.5-6.3 Di III-A and Fujifilm XF 70-300 F4-5.6 R 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 70-300 F4-5.6 R weighs 580g, 6% (40g) 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
Both the Tamron 18-300mm F3.5-6.3 Di III-A and the Fujifilm XF 70-300 F4-5.6 R have the same Filter thread size of 67mm.
Below are links to the 67mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Tamron 18-300mm F3.5-6.3 Di III-A and the Fujifilm XF 70-300 F4-5.6 R 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 XF 70-300 F4-5.6 R has a focal range of 70-300mm and 4.3X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 105-450mm when used on a APS-C / DX format camera.