For the canon eos d30 d60 300d 350d 400d 450d 500d 1000d 10d 20d 30d 40d 50d 5dmkii 1dmkiimkiin and 1dsmkii digital slr cameras canon e dioptric lenses provide near and far sighted users with a clear viewfinder image without wearing spectacles canon dioptric lenses only handle simple eyesight defects of long and 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 dioptr