"A True Milestone A journey of over 60 years of heritage, refining and developing techniques passed down decade to decade from the Kowa optical masters in Japan. This legacy leads us to where we are now - introducing the new compact Kowa TSN-550 PROMINAR - a truly unique spotting scope, designed to make your journeys truly memorable and immersive. Waterproof 10 Year Warranty Fluorite Crystal Fully Multi Coated Nitrogen Filled Polycarbonate Prominar - The Pinnacle Of Optical Excellence Only the finest optics deserve the accolade of the PROMINAR title. Optics that utilize Kowa's unique benchmark feature - fluorite crystal, delivering simply the best optical performance available today. Incredible Clarity At the heart of the TSN-550 PROMINAR series spotting scope beats a fluorite crystal objective lens. This natural mineral has an outstanding feature of very low dispersion that cannot be found in optical glass. This characteristic enables Kowa to eliminate color blur almost completely and dramatically increase resolution and contrast. Fluorite crystal is a unique feature of Kowa spotting scopes and is a testament to decades of Kowa optical developments. Fluorite Crystal - The Ultimate Viewing Experience A mysterious stone called fluorite, emits light like a firefly when it is heated or exposed to ultraviolet radiation. Fluorite has an outstanding feature o|Waterproof|10 Year Warranty|Fluorite Crystal|Nitrogen Filled|Polycarbonate|Fully Multi Coated"