The Sibir Zoom Spotting Scope features a Newtonian-style reflecting mirror optical path combined with a photographic quality Magnesium Fluoride multicoated lens system. This reflecting mirror light path system allows the scope to provide high resolution and image quality in a compact 9.5 inch unit. The polycarbonate case is rubber armored, providing an extremely durable impact resistant unit. This scope offers quality and function superior to scopes costing hundreds of dollars more. The Sibir is the perfect spotting scope for analysing the entry of a .223 cal at 100 meters with optional 'iron sight'. Your other spotting scopes can't do that!