Response to Pentax K mount and Pentacon SIX

Wrong forum to ask in, but yes, indirectly.
Pentacon themselves made an adapter from the Pentacon/Praktisix lens mount to M42 thread, which even allowed the auto diaphramn to work. These were usually sold as accessories for the 180mm-f/2.8 Sonnar, and the more expensive Zeiss telephoto lenses. They're quite rare now, but still turn up secondhand occassionally.
You'd have to use a second adapter from M42 to K mount to fit the Pentax-K, and you'd lose the iris automation.

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