I doubt it was on purpose.  We have 3rd parties that tried to improve on their mount a 
little.

Sort of like software that gets broken when a new operating system comes out.   Things 
happen.


Jostein Øksne wrote:

> I had the same problem with a Tokina AT-Z 60-300 zoom. Don't know if
> Pentax did that to the KAF2 cameras on purpose, though...
> Jostein
>
> "Robert P. VanNatta" wrote:
> >
> > I own a living walking example of a K-mount lens that is incompatible
> > with my ZX-5 or any other KAF2 camera body.
> >
> > It is is not a Pentax brand lens, however.   It is a Vivitar 120-600 zoom in the
> > original 'K' mount.   The problem is mechanical.  This lens has a quite long guard
> > on the back of it for the tang that sticks out of the back of the lens.   Long in 
>the sense that it extends 'around'
> > the lens  --- not in the sense of sticking back further
> > than necessary.
>
> --
> _____________________________________________________
> Jostein Øksne   | [EMAIL PROTECTED]
> Oslo, Norway.   | http://home.c2i.net/jostein.oksne/
>                 | http://www.fotonordic.com/
> _____________________________________________________
>
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