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Amazon.com : Panasonic LUMIX Micro Four Thirds Camera Lens, Leica DG Vario-SUMMILUX 25-50mm F1.7 ASPH, Stepless Aperture, Video Performance, H-X2550 : Electronics
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Amazon.com : Meike 50mm F1.7 Full Frame Large Aperture Manual Focus Lens for Panasonic Lumix Sigma Leica L-Mount Mirrorless Camera Such as S1, S1R,S1H, S5, FP… : Electronics
Panasonic Leica 25-50mm F1.7 ASPH field review: Digital Photography Review
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Amazon.com : Meike 50mm F1.7 Full Frame Large Aperture Manual Focus Lens for Panasonic Lumix Sigma Leica L-Mount Mirrorless Camera Such as S1, S1R,S1H, S5, FP… : Electronics