Archived posting to the Leica Users Group, 1997/02/18
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]seungmin@luxmail.luxcom.com wrote: > > Hi, > > I just bought a 50mm Summicron and noticed some lubricant was visible > on the back. I have seen some R lenses had lubricant on the lens > blades but nothing like this. I just wonder if it has any hidden > effect on the lens or is any sign of going bad. Any information will > be appreciated. > > David > seungmin@luxcom.com David, What part of the back of the lens? (the mount, the focus ring, the diaphragm?) Is it an M lens or an R? Anyway, assuming you mean on the diaphragm of an R lens, a little oil on the blades could prevent the diaphragm from stopping down properly. On an M lens this isn't a problem. The oil can cause a little bit of flair though, not usually serious, but a little less than ideal. Usually the lubricant will spread from where it should be if the less has gotten too warm. (the trunk of a car in the summer.) If it's not on the diaphragm I wouldn't worry about it, wipe it off. Hope this helps, Colin