This is the hoodeye for canon eos 1d 1ds mark iii and 7d cameras this eyecup is a great way to prevent excessive ambient light from entering your viewfinder by removing your cameras eyepiece and substituting the hoodeye you can improve your viewfinder clarity note this item is camera specific please make sure you get the one that fits your camera note will not fit the 5d and 5d mark ii rotates to accommodate both right and left eyed shooters