Alpen Teton Binoculars With Abbe Prism Full-Size Binoculars Alpen's exclusive PXA phase coating and SHR metallic coating on Abbe prism is featured for an exquisitely bright and crisp image. The composite body design provides light weight, yet durable, performance for years of field tough performance. Compare Alpen to competitors that cost two or three times more, you won't believe your eyes. HD - High definition, ED - Extra low dispersion optical system Abbe prisms with Alpen's exclusive SHR metallic coating for bright, sharp, high-resolution images A-lock diopter system allows you to set and lock the right eyepiece to fit your personal eye setting PXA phase coating for outstanding clarity and contrast Fully multi-coated for maximum brightness Long eye relief provides full viewing performance for eyeglass wearers Waterproof, sealed, and nitrogen filled for guaranteed internal fog-free performance Twist-up eyecups Cleaning Pen Included