I bought a secondhand Schneider 180mm Apo-Symmar a few months ago, and have noti ced that on the rear element, a white circle has appeared inside the lense on th e metal of the barrel. It looks as if the metal has been scraped in some way, bu t this could not have happened as it is the interior of the lense, behind the gl ass, that is affected. The glass appears unaffected. Does anyone know what this may be? Is this some ghastly fungus, and if so, should I ensure that the rest of my equipment is segregated to prevent spore drift? If not, what is it?
Bookmarks