Svbony SV49 monocular with 13x magnification and a 50 mm (about 1.97 in) objective lens. Eyepiece diameter is 20 mm (about 0.79 in). Field of view is approximately 342 ft at 1,000 yds (114 m at 1,000 m). Central focus, BK7 prism, multi‑coated optics and splash resistance to IPX4 make it suitable for outdoor use.