... is applicable to the seagull, Phoenix, Minolta, Canon, Nikon, Fujifilm, Pentax, Sigma, Contax and various single lens camera it use ... .Suitable for allMinolta 18mm eyepiece Fujifilm 22mm eyepiece Leica 22mm eyepiece, Praktica 22mm eyepiece, Contax ... ring - Turn the Dioptric correction ring until the view picture looks clear.3 Magnification leve - Use the magnification lever ...