Clear Protection Filter, Prevents Damage to Lens, 1x Filter Factor, +0 Stop, No Effect on Image, 127mm Front Filter Threads, ColorCore Technology. A simple filter for protection the 127mm Clear Uncoated Filter from Tiffen guards the front of your lens from dust scratches dirt moisture and other elements. As a clear filter it does not impart any effects onto the image. This filter is made using ColorCore technology; a process that involves grinding optical glass flat to a tolerance of 1/10 000th of an inch and then mounting to precision metal rings.