I had to take apart both Componon's that were shipped with my Durst D659. They developed haze on the inner surfaces including the rear of the front element. I'm guessed it was from living in a university darkroom for 40+ years. I had to use two solvents, alcohol and good old Ronsonol lighter fluid as it was not really water soluble, so I guess it might have been outgassing from lubricants in the lens? They sure are nice lenses now.