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The Canon +3 Diopter E for Canon EOS Cameras is an adjustment lens for your viewfinder eyepiece. It fits into the eyepiece holder of the camera. The dioptric adjustment lens provides near- or far-sighted users a clear viewfinder image without the use of eyeglasses. This one is compatible with the following Canon EOS DSLR cameras: D30, D60, 300D, 350D, 400D, 450D, 500D, 1000D, 10D, 20D, 30D, 40D, 50D, 5D/MkII, 1D/MkII/MkIIN and 1DS/MkII.