The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic S 70-200mm F4 and the Sigma 50-100mm F1.8 A 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 70-200mm F4 is the longer of the two lenses at 179mm. The Sigma 50-100mm F1.8 A with a length of 171mm, is 8mm shorter. On the other hand, the Sigma 50-100mm F1.8 A has a larger diameter of 94mm compared to the Panasonic S 70-200mm F4's 84mm diameter.
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Below you can find a scaled side-by-side image of Panasonic S 70-200mm F4 and Sigma 50-100mm F1.8 A 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. Panasonic S 70-200mm F4 weighs 985g, which means it is 505g (33%) lighter than the Sigma 50-100mm F1.8 A which has a weight of 1490g.
Filter Threads
The Panasonic S 70-200mm F4 has a filter size of 77mm whereas the Sigma 50-100mm F1.8 A has a 82mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Panasonic S 70-200mm F4:
And these are the 82mm filters that we recommend for the Sigma 50-100mm F1.8 A:
Lens Mounts
The Panasonic S 70-200mm F4 has the Leica L lens mount whereas the Sigma 50-100mm F1.8 A has the Sigma SA 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 Sigma SD1 Merrill, Sigma SD1 and for the Sigma SA Mount.
Sigma 50-100mm F1.8 A is also available in Canon EF and Nikon F (DX) mounts.
Focal Range
Panasonic S 70-200mm F4 has a focal range of 70-200mm and
2.9X zoom ratio .
On the other hand, the Sigma 50-100mm F1.8 A has a focal range of 50-100mm and 2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 75-150mm when used on a APS-C / DX format camera.