DXOMARK - Samyang 85mm F1.4 AS IF UMC Pentax lens review. Reasonably-priced and sharp when stopped down a little, the Samyang 85mm f1.4 AS IF UMC looks like a bargain: http://dxo.io/1OGe9t0
Samyang Mf 85mm F1.4 Umc Manual Focus Telephoto Lens For Sony Canon Nikon M4/3 Pentax K ,black Color - Camera Lenses - AliExpress
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Samyang 85mm f/1.4 IF UMC lens review with samples (full-frame and APS-C) - YouTube
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Samyang 85mm f/1.4 Aspherical Lens for Pentax SY85M-P B&H Photo