Nikon mc zoom eyepiece 13 30x20 45x25 56x all lenses are multilayer coated for maximum brightness of view field mcstands for multilayer coating the turn slide rubber eyecup is applied to the wide type eyepiece for comfortable viewing it helps you position your eyes at the correct eyepointoptics employ eco glass containing no arsenic or lead this eyepiece gives a 20 45x magnification with 60mm objective scopes and 25 56x magnification with 78 and 82mm objective scopes