Canon E Dioptric Lenses provide near & far-sighted users with a clear viewfinder image without wearing spectacles. Canon dioptric lenses only handle simple eyesight defects of long & short sight, they may not help other eyesight problems. Please note: a Rubber Eyepiece Frame is required as a replacement to the original eyecup to allow the dioptric lenses to be used. For the Canon EOS D30, D60, 300D, 350D, 400D, 450D, 500D, 1000D, 10D, 20D, 30D, 40D, 50D, 5D/ Mk II, 1D/ Mk II/ Mk IIN & 1DS/ Mk II digital SLR cameras.