E2 is not recommended for lenses or filters - use our original ECLIPSE Optic Cleaner. ECLIPSE E2 lens cleaner is the highest purity Tin Oxide CCD cleaner available, containing less than 5 parts per million (ppm) of contamination (the whitish residue left after evaporation) It dries as quickly as it can be applied leaving absolutely no residue, making it the only recommended cleaner for Tin Oxide CCD and CMOS sensor cleaning when used with Sensor Swabs.