Thanks useful information: 
Warning: Do NOT put an older Ricoh K mount lens directly onto a Pentax camera without first modifying it.
it won't come off otherwise
See:
http://www.theatreofnoise.com/2008/0...ras-ricoh.html << Modification needed
http://erdener.org/pentaxlensremoval/ How to remove it if you forget
Digital & film, Bits of glass covering 10mm to 500mm, and other stuff
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