When the L-Mount Alliance formed, it allowed companies like Panasonic to jump into full-frame mirrorless with a list of lenses already available. But, one thing the L-Mount family was missing was a zoom, with optics from Leica topping out at 280mm and, later, Panasonic at 300mm. When Sigma started converting its line-up of lenses to mirrorless, however, the L-Mount family gained a super-telephoto, the Sigma 150-600mm f5-6.
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