Three HD PENTAX-FA Limited interchangeable lenses for use with K-mount SLR cameras, featuring the latest HD coating and round-shaped diaphragm|RICOH IMAGING
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17) Pentax Aperture/Diaphragm Control Block Failures – PentaxForums.com | Old unionist
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Pentax 77860-G0100 Diaphragm Control Block | K-S2 | K-30 | K-50 | Parts
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How to repair DSLR camera Pentax K-r - exchange Diaphragm block control - YouTube
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Original For Pentax K30 K50 Genuine Aperture Solenoid Plunger Part Diaphragm Camera Replacement Repair Part - Circuits - AliExpress