Citiwide Digital MRC Filters, the acronym ""MRC"" stands for ""Multi Resistant Coating"". The lens coating normally used for Citiwide photographic filters and certain SCHNEIDER lenses is resistant in several respects.
The UV series offers high level UV and haze filtering. It is a MUST for taking nature shots in wide angles, total scenery, or even just simple portraits outside. As you might already know, this extremely affordable filter also back ups as a lens protector.