Digital HT filters are a state-of-the-art technological breakthrough in multi-coated photo and video filters. Made for the discerning professional and imaging enthusiast, Digital HT filters with Hi-Trans double-sided titanium multi-coating surpass even military specifications for hardness and durability.Digital HT - High Transmission - filters offer the strength of a Titanium coating combined with the purest optical quality glass and Tiffen's academy-award-winning ColorCore technology. They present unmatched scratch-resistant durability and worry-free cleaning while other coated filters on the market today cautiously suggest delicate, if any, cleaning procedures, in fear of destroying the coating (and thereby the filter).And that's not all - these High Transmission filters feature a low profile titanium finish ring and anti-reflective black lock ring which sets these filters apart from the rest.