X2 UV (Ultra Violet) FILTER: The X2 UV filter features critically sharp AGC glass made in Japan, MRC8 and our state-of-the-art nanotec nano coating layers which help to eliminate flaring, ghosting and low contrast. Our modern coating chambers are airtight, producing a uniform coating visible to the human eye when holding the filter at a right angle to a direct light source ELIMINATES VIGNETTING: The X2 features a 3.5mm ultra-slim double-threaded traction frame to eliminate vignetting on wide-angle full-frame setups. In our lab tests, 4.3mm was the frame width at which point vignetting becomes noticeable on 16mm wide-angle setups on full-frame setups. Any less than 3.0mm and lens caps don’t have enough surface area to grab onto. At 3.7mm vignetting is entirely eliminated. NANOTEC: In addition to state-of-the-art MRC8, our optical engineers developed new nano-coating layer technology, called nanotec, from the ground up to repel dirt, water and other elements by beading rather than absorbing and smearing. Set in our completely weather-sealed X2 traction frame the X2 UV was built to withstand the harshest of environmental conditions. DOUBLE-THREADED & LASER ENGRAVED: We laser engrave lettering into each X2 UV traction frame to ensure that the lettering won’t ever fade or come off after consistent use. We also engrave each and every X2 traction frame with a unique serial number. 25 YEARS SUPPORT: We stand behind every UV filter we make with our 25 Year Ironclad Guarantee. Every X2 UV filter has a unique serial number laser engraved on the interior frame. When you activate your 25 Year Ironclad Guarantee, we assign this serial number to you, so any future discussions on this unique filter are tracked, issues recorded and all that stuff which goes into future product design.