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Samyang Optics
Samyang 135mm F2.0 Ed Full Frame Lens Aspherical Telephoto For Sony Canon Nikon M4/3 Pentax K Mount Camera Lenses - Camera Lenses - AliExpress
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Samyang 135mm f/2 ED UMC lens review with samples (Full-frame and APS-C) - YouTube
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Review: Samyang 2/135 ED UMC - phillipreeve.net
Samyang 135mm f/2.0 ED UMC Lens for Nikon F Mount SY135M-N B&H
