Nikon mcii eyepieces for fieldscopes are multilayer coated for maximum brightness of view field mcstands for multilayer coating a turn slide rubber eyecup is applied to the wide type eyepiece for comfortable viewing it helps you position your eyes at the correct eyepoint optics employ eco glass containing no arsenic or lead 13 40x magnification with a 50mm lens 20 60x with 60mm lens and 25 75x with a 82mm objective lens