The 20x80 Military puts you at an effective distance of less than 100 yards from one mile-distant targets or other objects. Many spotters and observers are discovering these high power binoculars 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. Don’t let their light weight — they’re 30% lighter than look-alike competitors — fool you. 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 these models are light enough to be hand held. Depth of field is about 80 yards out to infinity once focused for your eyes.