John Hermanson , Feb 02, 2009; 11:52 a.m.
This lens can be a pain to work on. Focus mechanism has 370 - 1mm ball bearings in it (2 races of 185 ea.) . This ball bearing setup not found in other 35-70 Olympus OM lenses (thank god). Could be impact or just tight from non use or thickened lube. John, www.zuiko.com