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Dual 45 degree Split Image Focus Focusing Screen for Pentax K10D K20D ISTD DS DL PR137|split focus screen|screen - AliExpress
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Amazon.com : Pentax K20D 14.6MP Digital SLR Camera with Shake Reduction and DA 18-55mm f/3.5-5.6 AL II Lens : Camera & Photo
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PENTAX DSLRs: PART-1. Autofocus Adjustment charts for front and back focusing problems. Good for Pentax, Canon and Nikon.
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