The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 28-200mm F2.8-5.6 Di III and the Tamron 18-200mm F3.5-6.3 Di II VC 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 28-200mm F2.8-5.6 Di III is the longer of the two lenses at 117mm. The Tamron 18-200mm F3.5-6.3 Di II VC with a length of 97mm, is 20mm shorter. On the other hand, the Tamron 18-200mm F3.5-6.3 Di II VC has a larger diameter of 75mm compared to the Tamron 28-200mm F2.8-5.6 Di III's 74mm diameter.
Below you can find a scaled side-by-side image of Tamron 28-200mm F2.8-5.6 Di III and Tamron 18-200mm F3.5-6.3 Di II VC to get a better idea of how their sizes compare in real life.
Comparison image of the Tamron 28-200mm F2.8-5.6 Di III and the Tamron 18-200mm F3.5-6.3 Di II VC 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 18-200mm F3.5-6.3 Di II VC weighs 400g, 30% (176g) lighter than the Tamron 28-200mm F2.8-5.6 Di III's weight of 576g.
Filter Threads
The Tamron 28-200mm F2.8-5.6 Di III has a filter size of 67mm whereas the Tamron 18-200mm F3.5-6.3 Di II VC has a 62mm 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 28-200mm F2.8-5.6 Di III:
And these are the 62mm filters that we recommend for the Tamron 18-200mm F3.5-6.3 Di II VC:
Lens Mounts
The Tamron 28-200mm F2.8-5.6 Di III has the Sony E lens mount whereas the Tamron 18-200mm F3.5-6.3 Di II VC has the Sony Alpha 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 Sony A68 , Sony A77 II and Sony A58 for the Sony Alpha Mount.
Canon EF and Nikon F (DX) mounts.
Focal Range
Tamron 28-200mm F2.8-5.6 Di III 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 .
On the other hand, the 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.
