Fotodiox Eyecup for Canon EOS Digital 7D, 5D Mark III, 1D Mark III, 1Ds Mark III, 1D Mark IV, 1Dc, 1D-X
Replacing the existing eye cushion with the Fotodiox eyecup, it becomes more comfortable for the eye and safe for eye glasses.  The eyecup is made out of durable rubber and is an essential tool for any photographer that needs assistance reducing extraneous light and vision strain.