Kowa TSN-501 20-40x50 Angled Spotting ScopesAt 14 oz., Kowa TSN 501 20 40x50 Angled Spotting Scopes are lighter than a full size binocular, but much more powerful. The zoom eyepiece is permanently mounted, which helps with water and fogproofing. The body is polycarbonate, with standard glass, fully multi coated lenses. This scope has a close focus of 8. 2' and dual focusing knobs which provide both coarse and fine focusing speeds.