80 mm objective BAK4 prism optimizes light transmission HD optics: multicoated fluoride glass elements for superior edge-sharpness, digiscoping imagery, twilight performance Fully multicoated on all air-to-glass surfaces SWAROCLEAN coating: The non-stick proprietary external coating makes cleaning/removing dried-on mineral residue, insect repellent, and tree resin easier. Over time the lens' surface will require less intensive cleaning which significantly increases the longevity of the optic. Angled viewing Helical focusing is fast and accurate Tripod mounting: 1/4"-20 & 3/8"-16 Side-mounted peepsight to aid initial locating Rotating tripod collar with detented click stops Integral retractable lens hood shades and protects objective Lightweight magnesium housing is water and fogproof Nitrogen purged and sealed for water and fogproof performance Porro prism design offers maximum image quality, enhanced durability, traditional styling DEMO products may or may not include accessories.