Originally posted by rparmar I too have had no problem with either the Pentax or off-brand, though I think I threw away the off-brand adapter after getting annoyed with it.
If you remove that spring, which can be handy, be careful that the lens doesn't slip off the body! There wil be nothing holding it into place, no locking mechanism, so a quarter turn will undo it. Some then go further and drill a hole for the locking pin to fit, in the flange of the lens mount. But I never bothered.
Agreed. The reason I suggested 86ing the spring is that it takes some finesse and getting use to to remove the adapter. Many of these adapters come with 'keys' that are supposed to easily remove it. What I found with the first one I tried, I damn near ruined the lens mount of the camera. I now use a tweezer (forecept, pickup) to depress the spring on the adapters that still have them.
The lens does fit down quite tight to the body with the proper adapter so you do have to make sure it's on right. Some adapters fit more snugly than others and some are downright impossible (which is why I suggest the genuine article). The spring is more of a safety feature and you are right, care should be taken if the spring is removed.