The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 28-300mm F4-7.1 and the Tamron 18-300mm F3.5-6.3 Di for their suitability to various photography scenarios:
Size and Weight Comparison Below you can find a scaled side-by-side image of Tamron 28-300mm F4-7.1 and Tamron 18-300mm F3.5-6.3 Di to get a better idea of how their sizes compare in real life.
Comparison image of the Tamron 28-300mm F4-7.1 and the Tamron 18-300mm F3.5-6.3 Di 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. Tamron 28-300mm F4-7.1 weighs 610g, which means it is 10g (1%) lighter than the Tamron 18-300mm F3.5-6.3 Di which has a weight of 620g.
Filter Threads
Both the Tamron 28-300mm F4-7.1 and the Tamron 18-300mm F3.5-6.3 Di 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
The Tamron 28-300mm F4-7.1 has the Sony E lens mount whereas the Tamron 18-300mm F3.5-6.3 Di has the Fujifilm X lens mount . Some of the latest released cameras that are compatible with these mounts are Sony FX5 , Sony A7R VI and Sony A7 V for the Sony E Mount and Fujifilm X-T30 III , Fujifilm X-E5 and Fujifilm X-M5 for the Fujifilm X Mount.
Sony E mount.
Focal Range
Tamron 28-300mm F4-7.1 has a focal range of 28-300mm and
10.7X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
42 - 450mm .
On the other hand, the Tamron 18-300mm F3.5-6.3 Di 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.
