Originally posted by clockwork247 correct me if i'm wrong (and I may well be).
manual lens has no connection to begin with, how would it lose connection with the camera?
Stop down metering is full manual right? ...
No, not exactly. Or at least it depends on what you refer to the word "manual".
A manual lens such as a Pentax KA mount is manual focus, but all of the rest (exposure modes, metering modes, diaphragm operation) is fully automated.
A PK lens such as an M-series lens or a K-series lacks with modern digital Pentaxes also metering modes and program modes, you can only use them in manual mode and by manually operating the aperture ring.
A non Pentax lens or a screw mount lens (not always) or a T2 monut lens will also lack autimatic aperture operation. It means you'll have to actually stop down the diaphragm of your lens BEFORE you take the picture in order to meter. That will make your viewfinder really dim, and framing and focusing will become really hard.
You can still use the lens, but taking a shot will not be fast and easy, by any means.
All said you could make your life much easier by spending a few more buck and getting at least an M or K lens.