Oil Inside My Lens?
Greetings everyone, I was inspecting one of my lenses, my Canon FD F3.5 135mm and when I looked inside, I could see a brownish substance which looks a lot like oil coming out from where the screws are on the inside of the lens. Is this a bad issue? Will it affect how the lens works, or cause the lens to work incorrectly? Or possibly harm my camera?
Yes, yes, and probably not.
I don't know for sure. I'm only guessing, here.
I don't know why there would be any oil or grease inside a lens. Not enough to leak out, anyway.
If there is any lubricant inside a lens, it should be a very light coating. Too much grease or oil on small, precision parts causes more trouble than it's worth.
Could somebody have worked on it before you got the lens? That person might have put lube inside it.
The only other thing I can think of that might leak out of a lens is balsam cement.
Some lenses have their elements cemented together. Balsam is basically tree sap. It's distilled and purified but its source is the balsam tree.
The thing is, once the cement sets, it should become solid. I can't imagine why it would run out unless it was subjected to heat.
Most modern lenses don't use balsam, anymore. They are usually air gapped at precise tolerance.
Balsam can turn yellow or become cloudy over time.
That, having been said, I have seen movie projector lenses that have cemented elements which were overheated because some dummy projected white light through an open gate. In those cases, the cement does melt and get bubbles in it. I suppose, in extreme cases, it could run out.
Again, this is all just supposition.
I don't know any reason a lens should have enough oil or grease inside that it would leak out.
I don't know whether your lens has cemented elements.
Further, I can't imagine why oil, grease or cement would run out of a lens unless it was improperly repaired or subjected to abuse, especially extreme heat such as being left in an extremely hot car for a long time.
In any case, if the lens has been abused in the past (before you owned it?) there should be other symptoms. If it's a lens that you value and want to use, I'd have it looked at.
Old grease separates into a waxy component and a runny liquid component. The runny liquid component runs all over the inside of the lens if it's left there long enough.
Balsam is a resin, it is not tree sap. It is filtered, but it is not distilled either.
I had a lens once with a little oil on the aperture blades. I used it for a few years with no problems. Fortunately, it never got any worse.
I later sold it because I sold the camera that it went with. I fully disclosed the oil problem of course.
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Guilty of oversimplification... Balsam is a resinous, saplike substance obtained from the Canadian balsam fir tree which has been filtered, purified or processed in some way to make it suitable for use as an optical cement.
Originally Posted by E. von Hoegh
Last edited by Worker 11811; 08-17-2012 at 03:05 PM. Click to view previous post history.
I recently recemented a RR on an old folding Kodak that was my grandfather's. I used balsam collected from local trees, the only processing neccesary was to warm it, and let the particulate matter settle out. I figured it was worth a try.
Originally Posted by Worker 11811
The grease has not run all over the lens, fortunately, but might the way its stored cause the oil to leak? I leave my lens inside of its case standing up with the front of the lens pointing up. I have also included a photo of the substance to see if possible some of you could possible help me any further, because I really really appreciate all the help the great people of this great forum have helped me with.
*I inserted a picture, but somehow it got placed in the wrong part of the message.