The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 17-70 F2.8 Di III-A VC and the Fujifilm XF 18-120mm F4 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 Tamron 17-70 F2.8 Di III-A VC with a length of 119mm, is 5mm shorter. Besides being longer, the Fujifilm XF 18-120mm F4 also has a larger diameter of 77mm compared to the Tamron 17-70 F2.8 Di III-A VC's 75mm diameter.
Below you can find a scaled side-by-side image of Tamron 17-70 F2.8 Di III-A VC and Fujifilm XF 18-120mm F4 to get a better idea of how their sizes compare in real life.
Comparison image of the Tamron 17-70 F2.8 Di III-A VC and the Fujifilm XF 18-120mm F4 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. Fujifilm XF 18-120mm F4 weighs 460g, 12% (65g) lighter than the Tamron 17-70 F2.8 Di III-A VC's weight of 525g.
Below you can find the dimension and weight table of the Standard Zoom Lenses in Fujifilm X Mount for size comparison purposes.
Standard Fujifilm X Mount
Filter Threads
The Tamron 17-70 F2.8 Di III-A VC has a filter size of 67mm whereas the Fujifilm XF 18-120mm F4 has a 72mm 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 17-70 F2.8 Di III-A VC:
And these are the 72mm filters that we recommend for the Fujifilm XF 18-120mm F4:
Lens Mounts
Both the Tamron 17-70 F2.8 Di III-A VC and the Fujifilm XF 18-120mm F4 has the same Fujifilm X lens mount . Some of the latest released cameras that are compatible with the Fujifilm X lenses are Fujifilm X-T30 III , Fujifilm X-E5 and Fujifilm X-M5 .
Focal Range
Tamron 17-70 F2.8 Di III-A VC has a focal range of 17-70mm and
4.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
25.5-105mm when used on a APS-C / DX format camera.
On the other hand, the 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.
