Originally posted by stevebrot I hope you are joking Steve.
For many people, Canon is the obvious body choice because they are the universal recipient for SLR lenses originally designed for other cameras. I know that it causes deep pain to read of someone hacking the backside of a FA Limited just so it will work on a FF Canon, but a buyer has the perfect right to do what he pleases with what he buys.
As for me, I regularly shoot non-Pentax glass on my K10D and think nothing of it. Given a good deal on a lens, I might even mount a Nikon upside down or surgically alter Leica, Zeiss, Zuiko or any of several other brands to fit my camera. As for driving the price up for legacy glass, I guess any item is worth what the market will bear. If the Pentax glass is really "so superior", then I would expect that we should all pay for the privilege of using it...even the vintage stuff.
Steve (the other)
Steve, I typed all of this and then realized it sounds like the whole thing is directed at you. It's not.
I suppose I'm half joking, but it kind of depends on the lens.
M 50 f/2? who cares.
FA* 600 f/4, aperture lever butchered? There is a decent chance that a Canon owner is about to have a bad day. Sorry, but it's not cool, especially with the smug B.S. I get from the majority of Canon shooters I meet. Now I'm sure that someone out there is thinking "I'm a Canon shooter, and I'm not a smug jerk." If that is the case, then you should try extra hard not to offend people who shoot other brands. That includes not butchering lenses for other systems, which must be done to put a K mount lens on a FF Canon. It doesn't temporarily raise prices until the Canon crowd tires of the lens, it Permanently raises them, because the lens has been turned into a paper weight. It's not like there is a real shortage of lenses out there for the EOS mount. If the lenses for your system are too expensive or not good enough, then switch systems. After all, the number of solid copies in the world of the A* 135 f/1.8 is not going up.
As it turns out the OP is dealing with the one K mount lens that never had an Aperture lever, so I guess that one lens is the one exception to EOS FF / K mount butchery.