>>2954196this:
>>2954294although they might not have been totally clear:
Theres two types of AF interface in pentax:
screw drive - mechanical
HSM - electronic
same with aperture couplings, older ones are mechanical only, newer ones are mechanical with the option to select "A" mode on the lens aperture dial which allows the aperture to be controlled via the camera controls.
Film bodies will either have none (manual focus) screw drive only.
Digital bodies all have both afaik.
Some very new (DA & third party) lenses will have both mechanisms too.
Slightly older ones like F and FA series have screwdrive and electronic aperture.
The previous generation of A series have electronic aperture, but no AF.
K and M series are 100% manual AF and aperture.
If the lens has an actual aperture dial and has A mode on it (as well as f/diggits) then you can use it on any old film body by selecting the aperture on the dial, and if you put it on a fiklm body that suppports it, or a digital model then you can select A mode on the aperture and contyrol it via the camera body.
