CASETOP EyeCup for Canon EF EOS 10D 20D 30D 40D 50D 5D D30 D60 Mark-II Rebel X XS It works as a cushioning around the camera's eyepiece, which provides a protection for the camera's eyepiece. No matter you wear eyeglass or not, The hollow rubber of the eyecup is comfortable for your eyelid contact and your glasses. It impress you a comfortable feeling following a pleasant experience. This Eyecup is a replacement of Canon Eyecup EF. EyeCup for Canon EF EOS 5D Mark II/5D2/5D/60D/50D/40D