A recently acquired Kodak Ektar 203 mm come in a stuck Supermatic shutter. I removed the front and rear elements to give the shutter the ronsonol treatement. Since the elements were quite dirty as well, I cleaned the each surface of the front and back elements with Schneider photo-clear cloth and solution. Upon cleaning the back element, I noticed a tiny disk of fog/moisture in the center and *inside* the back-element. I waited a while and the fog disappeared. I'm sure that it was not on the surface and I cannot see any separation or haze now. What is this transient fog inside the back-element a symptom of?
thanks in advance,
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