The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 18-200mm F3.5-6.3 Di II VC and the Tamron AF 28-200mm f3.8-5.6 XR 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 18-200mm F3.5-6.3 Di II VC is the longer of the two lenses at 97mm. The Tamron AF 28-200mm f3.8-5.6 XR with a length of 75mm, is 22mm shorter. Besides being longer, the Tamron 18-200mm F3.5-6.3 Di II VC also has a larger diameter of 75mm compared to the Tamron AF 28-200mm f3.8-5.6 XR's 71mm 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. Tamron AF 28-200mm f3.8-5.6 XR weighs 354g, 11% (46g) lighter than the Tamron 18-200mm F3.5-6.3 Di II VC's weight of 400g.
Filter Threads
Both the Tamron 18-200mm F3.5-6.3 Di II VC and the Tamron AF 28-200mm f3.8-5.6 XR have the same Filter thread size of 62mm.
Below are links to the 62mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Tamron 18-200mm F3.5-6.3 Di II VC has the Nikon F (DX) lens mount whereas the Tamron AF 28-200mm f3.8-5.6 XR has the Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with these mounts are Nikon D3500, Nikon D7500 and Nikon D5600 for the Nikon F (DX) Mount and Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount.
Tamron 18-200mm F3.5-6.3 Di II VC is also available in the Canon EF and Sony Alpha mounts.
Tamron AF 28-200mm f3.8-5.6 XR is also available in Canon EF , Sony Alpha and Pentax KAF mounts.
Focal Range
Tamron 18-200mm F3.5-6.3 Di II VC 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.
On the other hand, the Tamron AF 28-200mm f3.8-5.6 XR has a focal range of 28-200mm and 7.1X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 42 - 300mm.
