The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic S 20-60mm F3.5-5.6 and the Tamron 17-50mm f2.8 XR II LD 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. Panasonic S 20-60mm F3.5-5.6 is the longer of the two lenses at 87mm. The Tamron 17-50mm f2.8 XR II LD with a length of 82mm, is 5mm shorter. Besides being longer, the Panasonic S 20-60mm F3.5-5.6 also has a larger diameter of 77mm compared to the Tamron 17-50mm f2.8 XR II LD's 74mm 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. Panasonic S 20-60mm F3.5-5.6 weighs 350g, which means it is 80g (18%) lighter than the Tamron 17-50mm f2.8 XR II LD which has a weight of 430g.
Filter Threads
Both the Panasonic S 20-60mm F3.5-5.6 and the Tamron 17-50mm f2.8 XR II LD 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 Panasonic S 20-60mm F3.5-5.6 has the Leica L lens mount whereas the Tamron 17-50mm f2.8 XR II LD has the Sony Alpha lens mount. Some of the latest released cameras that are compatible with these mounts are Leica SL3, Panasonic S5 II and Panasonic S5 II X for the Leica L Mount and Sony A68, Sony A77 II and Sony A58 for the Sony Alpha Mount.
Tamron 17-50mm f2.8 XR II LD is also available in Canon EF , Nikon F (DX) and Pentax KAF mounts.
Focal Range
Panasonic S 20-60mm F3.5-5.6 has a focal range of 20-60mm and
3.0X zoom ratio .
On the other hand, the Tamron 17-50mm f2.8 XR II LD has a focal range of 17-50mm and 2.9X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 25.5-75mm when used on a APS-C / DX format camera.