Quote Originally Posted by PentaxBronica View Post
As for adapters, is the lens you have an SMC Takumar or an SMC Pentax? Optically they're pretty much identical, but the SMC Takumars were the last series of M42 screw mount lenses while the SMC Pentax were the first K mount.
It's an SMC Pentax, the non-Takumar one.