ZR ( Zero Reflection ) Super Multi-Coating This innovative coating will not interfere with any colour or light transmission. Reflections are eliminated by allowing light to enter the filter at virtually any angle. This filter will produce superior results and can be used with any type of lens (wide angle to telephoto). Ultra Smooth Surface - Nano Glass Technology Our Nano Glass Technology creates an ultra smooth surface from the finest particles of glass, making it stain and scratch resistant without any effect to the image. Ultra Thin Frame The glass of this filter is set in a precision machined frame and attached using Retainer Ring Mount Technology giving this filter an unsurpassed durability. An ultra thin frame also makes it wide-angle lens compatible. L41 Super UV Cut Glass The Zeta UV L41 filter absorbs up to 410 nm of ultraviolet rays. Normal UV glass has a slight yellow tint, but the L41 is perfectly clear due to the use of high-performance glass. Absorbs the ultraviolet rays which often makes outdoor photographs hazy and indistinct. This multi-purpose, all-around filter can serve as a permanent lens protector. While designed specifically for digital cameras the Zeta series can be used on film cameras as well. The Zeta series debuted in 2009 after a long, exhaustive e?ort by Kenko to o?er the highest end ?lters. Adopting the ne.wly developed the ZR coat, which achieves one of the world?s best surface re?ectivity levels of 0.3% or less (or 0.6% or less with C-PL of low-temperature multi-coat speci?cation), the Zeta series cuts re?ection on the ?lter?s glass surface to eliminate ?are and ghosting. All Zeta ?lters use glass material of the highest quality, and their frame, which retains the ?lter glass, ensures the maximum degree of ?atness. Specs: Product Dimensions: 0.4 x 0.4 x 0.4 inches Item Weight: 0.16 ounces