Brightness and Optical Performance of the Highest Level in its Class These high performance models are the perfect fusion of compactness and high optical performance. This series satisfies the needs of hunters who need to detect game and see movement. 66MM OBJECTIVE LENS: The lens has more than 120% the light gathering capability of a 60mm objective lens, ensuring a bright field of view for observation. HIGH-END PROMINAR MODELS: The PROMINAR MODELS (TSN-663/664) with XD objective lenses are available for those who seek higher optical performance FULLY MULTI-COATED OPTICS: All lenses, prisms and dust proof glass are fully multi- coated, ensuring sharp images and a clear visual range. COMPACT & LIGHTWEIGHT BODY: The compact body of the TSN-660 Series is equivalent in length to a 60mm class spotting scope, and weighing only 1kg (36oz), the scope is extremely easy to handle and carry. WATERPROOF & FILLED WITH DRY NITROGEN GAS: The housing is waterproof to JIS* Protection Class 7** and filled with dry nitrogen gas to prevent the lens from fogging. *JIS=Japanese Industrial Standard **The Scope is not intended for use underwater Kowa TSN-662 66mm Straight Spotting Scope Body