This series is a demand for outdoor sports completely designed, reliable and versatile, built ranging reticle, ad hoc ranging slide rule, built-in compass, to meet the changing requirements of outdoor sports. Large diameter, high brightness and high contrast. Large-diameter, round antireflection coatings, multilayer broadband antireflection green film camera, in front ensure higher brightness and contrast, Especially in a dark environment, more than a telescope to see more details of the scene. Advanced prism, clear image, advanced BAK4 prism film, the edge of the image quality even if it is clear and bright.