Roof prism: The optics are designed in a straight line which results in a compact monocular. Japanese made with ED Glass: Crystal Clear images through ED Glass. This monocular will give clear sharp views. Flat Multi-Coating + Phase Coating + Ultra High Reflectivity Dielectric Coating + Hydrophobic Coating: The cutting edge coatings and manufacturing materials deliver the ultimate high-definition and true-to-life image. The extended 17.5mm long eye-relief: The extended 17.5mm long eye-relief for eyeglass wearer. And short close focus this monocular is great for all views. Specifications: - Magnification: 6x - Objective lens diameter:21mm - Prism material:BK4 / SK15 - Angular field of view:8.7 - Apparent FOV:52.2 - FOV at 1000m:152m - Exit pupil:3.5mm - Brightness:12.3 - Eye relief:17.5mm - Close focus:0.6m - Size:3.53.510.2cm - Weight:147g In the Box: - Vixen ARTES HR 6x21 ED Monocular Model: VX11485 - Hard case - Neck strap