hector_jorge Posted June 5, 2009 Share #1 Posted June 5, 2009 Advertisement (gone after registration) I bought a Summilux 1:1,4/50 made in 1960 according its number (1758536) The lens is almost mint, so I guess that the previous owner used it few times, but its diaphragm blades shows small traces of dry oil. The lens diaphragm operates perfectly as my other Leica lens, so my question is: Can I use the lens as it is or without a cleaning the diaphragm blades could be damaged? Thanks for your advise. Link to post Share on other sites More sharing options...
Advertisement Posted June 5, 2009 Posted June 5, 2009 Hi hector_jorge, Take a look here Oil in diaphragm blades.. I'm sure you'll find what you were looking for!
earleygallery Posted June 5, 2009 Share #2 Posted June 5, 2009 Shouldn't be a problem from what you have said. If it was severe it could affect the lenses and would need a CLA but if its light marking I'd ignore it. I have some traces of oil on my Summicron R and was advised to leave it so that the aperture was fully open - which has helped clear it. Of course on an R lens it can make the auto diaphram a bit sluggish, not an issue on an M lens. Link to post Share on other sites More sharing options...
marke Posted June 6, 2009 Share #3 Posted June 6, 2009 Hector, you said it looked like dry oil. Are you sure you're just not seeing wear marks from use? Sometimes that can appear as "dry oil". I bought a Summilux 1:1,4/50 made in 1960 according its number (1758536) The lens is almost mint, so I guess that the previous owner used it few times, but its diaphragm blades shows small traces of dry oil. The lens diaphragm operates perfectly as my other Leica lens, so my question is: Can I use the lens as it is or without a cleaning the diaphragm blades could be damaged? Thanks for your advise. Link to post Share on other sites More sharing options...
hector_jorge Posted June 8, 2009 Author Share #4 Posted June 8, 2009 Well...it is difficult to said that, but anyway, I guess that it is a very thin layer of dry oil that covers from the center part of the blades to its end.Last week I asked a local Leica expert, and he told me that those are traces of dry oil. He said too, that in some cases (it is not very frecuent), the dry oil can fasten the blades and maybe twist or break any of them. The lens and the camera that cames with it, looks unused for a long time, but in almost "mint" condition. Link to post Share on other sites More sharing options...
earleygallery Posted June 8, 2009 Share #5 Posted June 8, 2009 It may well just be marks from wear. If the aperture moves freely I really wouldn't worry about it. Link to post Share on other sites More sharing options...
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