Originally posted by B.Rosenfeld Dear Pentax,
In addition to using a DSLR, I also use a 35mm SLR. It would be nice to see you manufacture backwards compatible lenses. The lens diameter in your newer lenses may be fine for your DSLRs as their sensors are smaller than the 35mm frame, but to use on a 35mm camera? They're just too narrow. When I shop for a lens, I specifically look for 35mm SLR compatibility. Yours just don't make the cut.
That is just a silly request.
The FA ltd are still backward compatible with any Pentax film body on K-mount, so are all Zeiss glass.
If you are aventurous enough to still use film and buy a used film body, then you can shop for the zillion legacy glass in K-mount.
Apart from Leica M (which isn't autofocus anyway) no mount allow for such compatibility.