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, Advanced Prism, Clear Image, Advanced Bak4 Prism Film, the Edge of the Image Quality Even If It is Clear and Bright. This Series is a Demand for Outdoor Sports Completely Designed, Reliable and Versatile, Built Ranging Reticle, Ad Hoc Ranging Slide Rule, Built-Ins, to Meet the Changing Requirements of Outdoor Sports. Especially in Ak Environment, More Than a Telescope to See More Details of the Scene.