Lenspen's excellent activated carbon cleaner is always at the top of its game. Do you notice contamination on the optics? Dust the surface with the extendable brush, then unscrew the cap on the other end of the cleaner and the rubber cleaning head with its soft surface filled with activated carbon will clean the optics perfectly. Safe, quick and easy to use. An additional advantage of activated carbon cleaning is that it can be used without time restrictions; there is no moisture, so no dripping or evaporation; and it can be done comfortably with one hand. The size and design of the cleaning head make the Micropro particularly suitable for small surfaces such as SLR camera viewfinders, small binocular lenses, phone lenses, etc.