The celestron trailseeker 100 45 degree angled spotting scope has a rugged and durable rubber armored housing that is fully waterproof and nitrogen filled'. '.strtoupper('t')he optical system with proprietary xlt multi coatings renders high resolution images with outstanding contrast, while the dual focus mechanism allows you to find subjects in focus quickly and then fine tune the image'. '.strtoupper('f')eatures celestron's proprietary xlt fully multi coated optics increase light transmission through the optical path to deliver crisp, high contrast images'. '.strtoupper('f')ocus on a subject quickly, then fine tune the image using the dual focus mechanism with course and fine adjustments'. '.strtoupper('g')et the whole picture using the rotating tripod mount'. '.strtoupper('t')his mount rotates a full 360 deg and allows the eyepiece to be set in any viewing position'. '.strtoupper('g')et close to the action with a zoom up to 67x magnification or see the widest field of view at 22x'. '.strtoupper('p')erfect for those who want performance in an easy to carry package, the 100mm objective design lets in plenty of light while keeping the overall size of the scope to a minimum'. '.strtoupper('s')pecifications magnification 22 67x objective lens diameter 100mm lens coatings fully multi coated xlt coatings angular field of view 1.8 deg 0.9 deg linear field of view 94 47ft 31 16m 1000yds m close focus 29.5ft 9m eye relief 18 15mm exit pupil 4.4 1.5mm prism bak 4 waterproof waterproof and fogproof nitrogen filled