Heliopan 46mm UV Filter (704601) with specialty Schott glass in floating brass ring Features a 5-Year Drop Protection Warranty that provides end-users with a one-time, "no-questions-asked" replacement for any broken or damaged UV or Protection Filter. Filters must be purchased new and from an authorized US Retailer. Proof of purchase is required to qualify for a replacement. For more information, please visit our website. Our standard 8-Layer Multi-Coating minimizes reflections and does not interfere with the resolution of your camera optics. Our slim brass filter mounts ensure that the filter will keep its shape, be more resistant to side impacts, and be less likely to bind to a lens after extended use. Constucted from the highest German Schott Optics, which guaranteeds incredible optical resolution. Our glass is specially ground and polished to minimize internal reflections, while ensuring that the quality of your images are not degraded by using our optics in front of your lens. It is also specially hardened to resist most impacts. We do not source any materials outside of Germany in the assembly and construction of our products. All raw materials are prepared and hand-assembled in our factory and do not leave our facility until they are completely inspected by our quality technicians.