The Pentax PF-80ED is a premium quality spotting scopes. Engineered to meet the avid wildlife viewer, this scope incorporates ED glass elements, porro-prism optics and a nitrogen filled (JIS Class 6) waterproof body producing outstanding brightness, clarity and resolution even under demanding conditions. Add in, that the PF-80ED utilizes Pentax telescope eyepieces renowned for their sharpness, field of view, contrast and freedom from aberration and you have a great viewing instrument.