I obtained a near mint Linhof Technika Press with Zeiss objectives from an estate sale. There is one problem: The 53mm Biogon rear element was in contact with cellophane for several years and remnants of it are on the surface of the lens. It is a very thin film but lens cleaner will not remove it. Before sending it off to Focal Point Lens or similar, is there anything else I could use that is stronger but won't strip the coating?
Also, I notice that one of the rear elements has about a 1mm air bubble in the middle of the lens! I don't how this got through inspection at Zeiss.....so I'm assuming that it must not effect image quality to any measurable degree?
Please advise. Thanks for your help!