Originally posted by bigjonnee ...snip.... One other thing that occured to me is that mainstream APS-C DSLRs have only been around for a few years. And the film lenses made most obsolete by DSLRs are wide angles lenses. ...snip... (since old ones don't work) ...snip....
say what?
Film lenses are made obsolete by DSLR and they don't work?????
Well, they do work, and AFAIK they are still valuable. The new lenses are (most probably) better corrected for CAs and PFs (although even venerable 12-24 gets a purple "blush" at times).
And the film lenses are enjoying the sweet spot advantage with APSC sensors which may give them advantage with regards to distortion, and corner sharpness!
And because Pentax didn't exactly make many UWAs (correct me if I'm wrong, but there were only K15, K18, A15 [only handfull] and than only 20mms or FEs) and they are quite a chunks of glass they are fairly costly!
So, don't get me wrong but I think that those two assumptions you made there are simply wrong.
BR
Peter