Multi-layer coating, light transmittance of more than 90 percent , effectively eliminate stray light, improve transmittance. Dusk or night observation also maintains transparency and color reproduction. A large 50mm objective, a larger exit pupil diameter and a larger effective light passing area for a higher field of view brightness ensure sufficient luminous flux even when observing in dim light conditions. Humanized pupil design, the pupil distance range of the telescope is 60-70mm, which is generally suitable for most people. Compass positioning, differential and distance measurement, ingenious craftsmanship, complete functions, built-in mechanical compass, measurement position according to geomagnetic field deviation, high precision, error not more than 2. Anti-slip all-inclusive rubber decorative leather, wear-resistant and anti-slip high-quality all-inclusive rubber decorative leather, improve the stability and safety of the whole machine, enhance the feel and service life of the telescope