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PK gum
Having owned numerous Pentax cameras over the decades and a K10D (the model down from your's) I can tell you categorically that you need the PK adaptor. The M42 will only be useable if you get a PK to Pentax screw thread adaptor. Do note, the M42 adaptor could be used on almost any camera with an adaptor, but better to have the single T mount adaptor to keep things simple and less chance of the wobbles. Happy snapping
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