Alongside a recent Panasonic shooting experience in Austin, Texas for the Lumix S1R and Lumix S1 cameras, I also had the opportunity to try out the first three of Panasonic’s native L-mount lenses, the 24-105mm f/4, 50mm f/1.4 and 70-200mm f/4.

Launching a new camera system is tricky for many reasons. In Panasonic’s case, because the S1 and S1R use full-frame sensors instead of the much smaller Micro Four Thirds sensors in their other Lumix interchangeable lens cameras, the S series required a new, much larger lens mount. Panasonic has employed Leica’s L-Mount and alongside Leica and Sigma, created a new L-Mount Alliance. The Panasonic and Leica connection has long been present with other Panasonic cameras, so it is not a surprising match for the new S Series.
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https://www.imaging-resource.com/news/2019/03/12/panasonic-s-lenses-hands-on-with-the-24-105mm-f-4-50mm-f-1.4-and-70-200mm-f