The aperture ring on my Fotodiox adapter does not stay set. That is, it moves easily from the setting I want before I take a picture. I can manage by keeping a finger on the ring while I set focus etc but I wonder if others have found a solution for this. I also wonder if it is just my copy of the adapter. I do not remember having this problem in the past with other adapters. I can, of course, just buy another adapter but I would rather just fix it if that is possible. Thanks for your thoughts.