You definitely can add pretty much any brand of lens -- if you are doing macro work with a bellows! As for infinity focus, you will be out of luck with most other brands of lens unless you either get them modified via Leitax (e.g. Leica R/Olympus/Contax modified for Pentax K) or opt for the Pentax K+ Multi-Mount (PK+MM) from the Adaptist mentioned elsewhere on this site. I think the general opinion is that those eBay adapters with glass are not recommended if you want to maintain quality.
YMMV
Michael
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