Fotasy ECII Eyecup replaces Canon Eyecup EC-II, for Canon EOS 1v/1N/1N RS/1D/1Ds and 1D Mark II Camera (Black) It provide cushioning around the camera's eyepiece It is especially useful to eyeglass wearers Compatible with Canon Eyecup EC-II f Block out unwanted light from your viewfinder For Canon EOS 1v, 1N, 1N RS, 1D, 1Ds & 1D Mark II Camera