The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 70-300 F4.5-6.3 Di III and the Sony E 18-200mm F3.5-6.3 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 70-300 F4.5-6.3 Di III is the longer of the two lenses at 148mm. The Sony E 18-200mm F3.5-6.3 with a length of 99mm, is 49mm shorter. Besides being longer, the Tamron 70-300 F4.5-6.3 Di III also has a larger diameter of 77mm compared to the Sony E 18-200mm F3.5-6.3's 76mm 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. Sony E 18-200mm F3.5-6.3 weighs 524g, 3% (21g) lighter than the Tamron 70-300 F4.5-6.3 Di III's weight of 545g.
Filter Threads
Both the Tamron 70-300 F4.5-6.3 Di III and the Sony E 18-200mm F3.5-6.3 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 70-300 F4.5-6.3 Di III and the Sony E 18-200mm F3.5-6.3 has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony FX5, Sony A7R VI and Sony A7 V.
Focal Range
Tamron 70-300 F4.5-6.3 Di III has a focal range of 70-300mm and
4.3X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
105 - 450mm.
On the other hand, the Sony E 18-200mm F3.5-6.3 has a focal range of 18-200mm and 11.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-300mm when used on a APS-C / DX format camera.
