The original Leica SL (Typ 601) was launched in 2015 and was Leica’s answer to the professional mirrorless system. It featured a premium build quality, weatherproofing, two SD card slots and a fantastic viewfinder. The price, unsurprisingly, was prohibitive and uncompetitive compared to the many mirrorless models that came after it.

Four years later, Leica has joined the L-mount alliance with Sigma and Panasonic, which gives users access to more gear and lenses for L-mount camera users. The SL2 follows the release of the Lumix S1, S1R and S1H, as well as the Sigma FP, to become the fifth full frame model using the L-mount.
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https://mirrorlesscomparison.com/preview/leica-sl-vs-sl2/