Designed for long-distance and astronomical views, the variable magnification range of the Gladiator Series allows the view to scan a large field of view and zoom in on whatever might catch their eye using the convenient thumb lever. With BK-7 porro prisms and tinted ruby colored lenses to lessen ultra-violet glare, these bionoculars also feature multi-coated optics, large objective lens, shock absorbing rubber armor & tripod adaptable fittings making it an ideal choice for outdoor activities and sporting events.