Are you looking for the clearest visual effect from Monocular telescopesbr/ br/ The Monocular is coated and sealed with an fmc multi-layered broadband green film to luminousness up to 99. 5%.br/ br/ our field of view is approximately 430ft at 1000 yards.br/ br/ our Monocular telescope is crafted with an internal BAK4 Prism, providing visual fity and excellent light sources for sporting events, concerts, bird watching, hunting, hiking, camping, fishing and traveling. It is not just a telescope for adults, but also for kids.br/ br/ telescope's ework makes it usable for the toughest weather conditions. Rubber armor makes it comfortable for use and keeps it from slipping out from your hands. as long as the phone camera is aligned with the center of the holder, no matter how much the phone moves, the vision will not be blocked. if you want the image to fill the entire screen, you must zoom in by hand.br/ br/ product informationbr/ Parameters: 10X42br/ Lens material: BK4br/ Coating: Multi-layer coatingbr/ Eyepiece diameter: 12mmbr/ Objective lens diameter: 40mmbr/ Field of view range: 211ft@1000ydsbr/ Weight: 330gbr/ Size: 145*55*80mm