Originally posted by fiveseven I have some a bit larger in diameter M42 thread lenses that won't fit K100D or even K-x..... Not sure why Pentax did not designed their cameras similar to Canon or Olympus where there's more room for larger lenses, like older M42 or mirror lenses.
AFAIK, only mirror lenses have large diameter right from the back and there are not a lot of mirror lenses exist. Also a majority of those few mirror lenses can be mounted on Pentax bodies. So this problem is very specific so I don't think you can just blame Pentax engineers for this. BTW, how about Nikon and Sony, did they design their cameras to fit your random spec?
I don't know but I can not imagine the Canon and Olympus engineers have actually extensively studied hundreds of lenses from foreign countries when they designed the camera bodies. I also can not imagine the Pentax engineers have really carefully designed the Pentax bayonet mount so that the Nikon lenses could fit if put on certain angles. I also can not imagine the Canon engineers have thoughtfully designed the 5D mirrors so it would hit rear element of old popular lenses made by rival companies. There is also the famous Ricoh pin issue, is the Pentax engineers to be blame for this?
My guess is they're all pure co-incidence / bad luck.
To answer you question, if you really dedicated to those lenses maybe you can try to re-assemble them (no idea if this is even possible, though). Anyhow, you might find this thread handy:
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/64271-impossible-lens-club.html .
Last edited by sajah; 09-05-2010 at 10:53 PM.