All NAUTIC models have a water resistant and robust rubber armor as well as nitrogen purged optical tubes. Fully multi coated Bak-4 optics allow for a bright and sharp image to be obtained, even if the weather conditions have turned bad. The NAUTIC 8x25 is a compact monocular telescope which is designed for water sports. It is small and lightweight enough to be carried in the trouser pockets, still it offers a 8x magnification - perfect for nautic applications. The supporting loop provides additional security during daily use. The dioptre adjustment can also be used for focusing. end tab Features Nautic Binoculars and Monoculars are as the name suggests specially designed for use on and around water Waterproof, 122 mm Field of View at 1000m distance Light intensity 9.76, twilight factor 14.14 Monocular Dimensions: 113x37x50 mm, Weight: 164 g Bright and sharp images Large field of view Suitable for spectacle wearers Includes: Monocular, Nylon belt pouch, Carrying strap, Lens cloth Instruction manual end tab Specs Item Number 18?66861 Magnification 8 Field of View 122 m/1000 m Lens Coatings fully multi-coated Eye Relief mm Exit Pupil mm Focuser Type individual eyepiece Dimensions 113x37x50 mm Brightness 9.76 Objective Lens Diameter 25 mm Apparent Field 6.9? Close Focus 5 m Prism BaK-4 Eyecup Type Rubber eyecups, foldable Housing Plastic Weight 164 g end tab Warranty Limited USA Five Year Warranty when product is registered within 60 days of purchase. Click Here to register. end tab CA Residents: Prop 65 WARNING(S)