Richard,

I have spoken to our service department and they suggest that you may be overtightening the ring.
If it needs cleaning it is suggested that it is returned to a Mamiya service centre.

By Richard on Tuesday, August 03, 2004 - 12:04 am:

I have a Pro S with the 127mm lens attached and am having a few problems removing the lens.

After attaching the lens I find it extremely difficult to remove it due to the fact that the bayonet ring has locked on very tight.

Is there some cleaning I can do to help alleviate this problem or is it fairly normal for Mamiya lenses to be this difficult to remove from time to time?