Originally Posted by Canada_Rockies
Do you have the Pentax brand M42 adapter? If not, that could be your problem. The adapter should sit absolutely flush with the face of the bayonet mount so that the lens is touching the mount - otherwise you cannot focus to infinity.
Yep, the official Pentax adapter in the green-backed plastic pouch. Works great with my other M-42 lenses.
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Pentax K10D :: Pentax-M 200/4 :: Tamron 70-150/3.5 (Adaptall-2) :: LZOS MC Jupiter-9 85/2 :: Pentax-A 50/1.7 :: Pentax-M 50/1.7 :: Sigma 50/2.8 EX DG Macro :: Auto-Rikenon 50/1.7 (M42) :: Pentax-FA 35/2 :: Tamron 28/2.5 (Adaptall-2) :: Pentax-DA 18-55/3.5-5.6 :: KMZ MC Zenitar 16/2.8 :: Pentax Bellows-K
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