I am learning my new/old ST701. I noticed that when the lenses are screwed tight, the little diamond showing the apeature setting is not centered on the top. It would take maybe another 1/4 inch of turn to be exactly at the top. It does this with all 4 lenses that I got with it, including two Asahi Glass lenses. Were these cameras designed that way or is there a problem? Is it anything to worry about? Is it correctible?