The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 18-50mm F2.8 DC DN C and the Panasonic S 20-60mm F3.5-5.6 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 Sigma 18-50mm F2.8 DC DN C with a length of 75mm, is 12mm shorter. Besides being longer, the Panasonic S 20-60mm F3.5-5.6 also has a larger diameter of 77mm compared to the Sigma 18-50mm F2.8 DC DN C's 65mm diameter.
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Below you can find a scaled side-by-side image of Sigma 18-50mm F2.8 DC DN C and Panasonic S 20-60mm F3.5-5.6 to get a better idea of how their sizes compare in real life.
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. Sigma 18-50mm F2.8 DC DN C weighs 290g, which means it is 60g (17%) lighter than the Panasonic S 20-60mm F3.5-5.6 which has a weight of 350g.
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Filter Threads
The Sigma 18-50mm F2.8 DC DN C has a filter size of 55mm whereas the Panasonic S 20-60mm F3.5-5.6 has a 67mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 55mm filters that we recommend you to consider for the Sigma 18-50mm F2.8 DC DN C:
And these are the 67mm filters that we recommend for the Panasonic S 20-60mm F3.5-5.6:
Lens Mounts
Both the Sigma 18-50mm F2.8 DC DN C and the Panasonic S 20-60mm F3.5-5.6 has the same Leica L lens mount. Some of the latest released cameras that are compatible with the Leica L lenses are Leica TL2, Leica TL and Leica T Typ 701.
Sigma 18-50mm F2.8 DC DN C is also available in Sony E and Fujifilm X mounts.
Focal Range
Sigma 18-50mm F2.8 DC DN C has a focal range of 18-50mm and
2.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
27-75mm when used on a APS-C / DX format camera.
On the other hand, the Panasonic S 20-60mm F3.5-5.6 has a focal range of 20-60mm and 3.0X zoom ratio .