The Steiner 20x80 Military binocular puts you at an effective distance of less than 100 yards from one mile-distant targets or other objects. Many military and tactical spotters are discovering Steiner's high power binoculars like the 20x80 Military are easy to use, give them a better view and offer a lot more comfort during extended use than spotting scopes. And the 80-mm objective lenses, combined with Steiner’s legendary optics, deliver far superior low-light performance. 30% lighter than look-alike competitors, these binoculars were developed for military and border patrol applications and are mil. spec. tough: totally waterproof, shock resistant, and rubber armored. Tripod mount is included, but they are light enough to be hand held. Depth of field is about 80 yards out to infinity once focused for your eyes.