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Author Topic: Lens cleaning tips Robert Throop Master Film Handler Posts: 412 From: Vernon, NY USA Registered: Jun 99 posted 04-11-2003 12:09 PM                     I've acquired some lenses that had been installed in a damp cellar and have developed some type of mold on the glass. Does anyone have a suggestion on how to safely clean them without damaging the coating?  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 04-11-2003 12:13 PM                        Dwight Lindsay may have some suggestions. Here's Schneider's white paper on lens cleaning: http://www.schneideroptics.com/info/white_papers/lens_cleaning.pdf And Edmund Optics: http://www.edmundoptics.com/TechSupport/DisplayArticle.cfm?articleid=265 http://www.edmundoptics.com/TechSupport/optics.cfm  |  IP: Logged Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 04-11-2003 04:40 PM                        Has anyone ever tried _baking_ lenses in a warm (~200 degrees) oven? I've heard of people doing this with success when the problem is glue separation, but I'd be fearful of trying it myself without personally talking to someone who had found success with this method. Obviously it wouldn't work with any lenses that have plastic parts (are there any projection lenses that do?) and the lens would need to be removed from its collar to avoid the possibility that the lens would expand faster than the collar and possibly crack.  |  IP: Logged Aaron Mehocic Jedi Master Film Handler Posts: 804 From: New Castle, PA, USA Registered: Jun 99 posted 04-11-2003 05:21 PM                     Scott: In regards to your first question, yes, I have heard of this and it was suggested for me to do this by our booth tech some years ago. He recommended 120 - 140 degrees F. Like you I am uneasy about doing that without some supervision or a real clear understanding just what exactly I'm getting into.  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 04-11-2003 05:30 PM                     I had an old timer who purchased old lenses who would heat them in cooking oil to dissolve the cement, disasemble and put them back into service...very labor intensive but he had plenty of time being retired Richard Fowler Kinoton America Inc.  |  IP: Logged Dan Lyons Jedi Master Film Handler Posts: 698 From: Seal Beach, CA Registered: Sep 2002 posted 04-12-2003 01:55 AM                     Robert, what make and model are these lenses? If there is mold on the inside and out, it may be a lost cause. Danny  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 04-12-2003 10:05 AM                     Certain molds also attacked the coatings actually etching the glass Berthoit lens seemed to have that problem the worse  |  IP: Logged

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