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The Eyecup provides cushioning around the camera's eyepiece,and is especially useful to eyeglass wearers
Cushions your face while looking through the viewfinder
Made of rubber & plastic for soft eye contact. You can even view it with your glasses on
Attaches to the viewfinder eyepiece minimizing extraneous light and vision fatigue
For a more comfortable fit, replace the original one with this rubber eyecup
Selens EyePiece for Canon EB 5D 20D 30D 10D EOS D60 66 300 D30 10 300V 88 100 500 500N 700 750 850 1000N 1000FN - B01N4OZQRG