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 Sony E 18-55mm F3.5-5.6 OSS for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Tamron 28-200mm F2.8-5.6 Di III is the longer of the two lenses at 117mm. The Sony E 18-55mm F3.5-5.6 OSS with a length of 60mm, is 57mm shorter. Besides being longer, the Tamron 28-200mm F2.8-5.6 Di III also has a larger diameter of 74mm compared to the Sony E 18-55mm F3.5-5.6 OSS's 62mm diameter.
The weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Sony E 18-55mm F3.5-5.6 OSS weighs 214g, 62% (362g) lighter than the Tamron 28-200mm F2.8-5.6 Di III's weight of 576g.
Below you can find the dimension and weight table of the SuperZoom Lenses in Sony E Mount for size comparison purposes.
SuperZoom Lenses in Sony E Mount for Size Comparison
Lens Mounts
Both the Tamron 28-200mm F2.8-5.6 Di III and the Sony E 18-55mm F3.5-5.6 OSS has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A9 III, Sony A7C Mark II and Sony A7CR.
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.
Sony E 18-55mm F3.5-5.6 OSS has a focal range of 18-55mm and 3.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-82.5mm when used on a APS-C / DX format camera.