Nikon MCII Eyepieces for Fieldscopes are multilayer coated for maximum brightness of view field (“MC”stands 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