Originally posted by boriscleto The Soligor likely has the 'Vivitar' aperture flange.
The flange is longer than the standard Pentax flange and SDM power contacts prevent the lens from mounting.
There are probably 3 or 4 JIS screws holding it on. You can remove the flange and cut it down, or just leave it off.
Thank you!
I compared that lens to the Quantray and the pentax lenses and had a hunch that flange was the problem.
Its the fastest of my 2 older tele-zooms, and since it wouldn't work as is, I figured I didn't have much to lose!
I was afraid to dissemble it, so last night before dinner I wrapped the whole lens in a plastic bag,
and used duct tape or electrical tape to seal every opening, so no metal particles could get down into the lens.
I got my handy Dremel out, loaded a grinding disc and ground that flange off.
(In case this sounds way-funky, I had worked as a machinist before my college years,
did small appliance repairs for Sunbeam, and worked at Argus during college).
Just in case, I painted over any shiny metal with a black sharpy.
With the flange gone, the lens dropped right into place on the K-x!
Now, all 3 of my old lenses will mount up!
Thanks so much for the tip!