Sigma says they will make APS-C lenses for L mount but Panasonic says they will NOT – L mount system camera rumors and news
Wide-T-Ring for Leica, Sigma, Panasonic-L with D52i to T-2 and S52
Sigma 85mm 1.4 Art L Mount & S PRO 50mm: L-mount (Panasonic/Sigma/Leica) Talk Forum: Digital Photography Review
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Size Comparison: Sigma fp vs Sony, Nikon, Canon and Panasonic | PetaPixel