The porro prisms are on the inside sealed with putty, thus reducing the number of glass/air boundary surfaces and lowering the portion of reflected light. It goes without saying that all optically effective elements (prisms, eyepiece lenses and object lenses) are equipped with the DOCTER® multitop multi-coating. The ergonomical peculiarities that excellently match the binoculars' practical applications are a further guarantee for perfection and versatility. The same goes for the elastic non-slip armoring, the ideally arranged control elements and the well-thought-out center of gravity. Noblex | Docter Optics Nobilem 15x60 Green Binocular 50873