Vortex Optics Viper HD Spotting Scopes The Viper 15-45x65 Straight Spotting Scope puts incredible viewing at your fingertips. XR anti-reflective coatings team up with XD extra-low dispersion glass for images that are bright, crisp, and sharp. Dual focus wheel allows for maximum focusing precison with both coarse and fine focus adjustments. Eyecup twists up and down for comfortable viewing with or without glasses. Rotating tripod ring allows rotation of the eyepiece to a sideways position. Sunshade reduces glare and shields the objective lens from rain and snow. O-ring sealed and argon purged, the Viper delivers waterproof and fogproof performance. Armortek coatings protect the lenses from oil, scratches, and dirt.