Clear Protection Filter, Prevents Damage to Lens, 1x Filter Factor, +0 Stop, No Effect on Image, Standard Coating, 30mm Front Filter Threads, ColorCore Technology. The Tiffen 30mm Clear Filter is a simple clear filter with a 1x filter factor and is designed to provide general protection for your lens. This optically clear filter does not affect the overall image quality while helping to prevent dust scratches moisture and other elements from reaching or damaging your lens. This filter features standard coating for helping to reduce flare and improve light transmission. Tiffen filters are made using ColorCore technology; a process that involves laminating the filter substrate between 2 pieces of optical glass grinding flat to a tolerance of 1/10 000th of an inch then mounting to precision metal rings.