Hi Marc
Just to add to Eric’s burst above, I have 3 generations of Pentax K mount lenses:
- A Pentax, 50mm F1.8 (c1976): This requires manual focusing and manual setting of the aperture.
- A Vivitar Series, 1 80-200 (c1985): This requires manual focusing but I can set the Aperture ring on the lens to “A” for automatic.
- A couple of Sigma kit lenses that came with my *istDS: Full auto focus, etc.
However, IIRC, you need to make a change in the Menu settings somewhere to allow manual focus, non-auto aperture lenses to work.
Cheers
Dennis