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Ricoh announces development of Pentax 50mm F1.4, adds lenses to K-mount roadmap: Digital Photography Review
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Olympus OM 50mm f/1.8 vs Pentax K 50mm f/1.7 - cheap vintage Lens for Film and Video - SHOOTOUT! - YouTube
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PENTAX SMC Pentax-M 50mm F/1.4 K mount MF Lens from Japan (C1330) | Big Fish J-Camera (Big Fish J-Shop)
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