Sig Sauer Oscar 3 Spotting Scope Stabilized 10-20X30 Image Riflescope The low dispersion, fully multi-coated glass with BAK4 prism provides you with the maximum in color clarity and image brightness creating crisp resolution and image contrast Dependable waterproof (IPX-4 rated) and fog-proof performance 10-20x magnification range adjustment directly in front of the eyepiece along with a focus adjusting objective Utilizes a rugged, lightweight polymer housing wrapped in a durable rubber armor for extreme grip and protection. Offers a multi-position twist-up eyecup that provides a generous eye relief for all users