The new Via Nova series from Optolyth is their top of the line. Models feature: all internal precision adjustment mechanisms, large center focus wheel and SEPARATE diopter adjustment knob. Beautiful european lines, oversize oculars with soft "twist-up" eyecups, long eyerelief for eyeglass wearers and full rubber armor. Phase corrected roof prism design, Ceralin-Plus fully multicoating broad band technology, deliver the finest low light optical performance, brilliant colors, exceptional clarity and resolution. The B/GA 8x56 Via Novas are Argon gas charged and waterproof.