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Pentax Super SMC Takumar 20mm F4.5 Wide Angle LENS ( TESTED ) - Simpson Advanced Chiropractic & Medical Center
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Amazon.com: PENTAX smc PENTAX XW40-R, 2-Inch Eyepiece for Telescopes High-Performance Eyepiece with an Extra-Wide 70°Apparent Angle of View, 20mm Eye Relief Original Multi-Layer Coating All-Weather Made in Japan : Sports & Outdoors
SMC Pentax 20mm f/1.4 (1976) - Re: Does anyone know about this lens?: Pentax SLR Talk Forum: Digital Photography Review
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