ZigView IP200C Canon Eye Piece Adapter for the S2 Viewfinder System

Rectangle type. This eyepiece adapter is compatible with the following Canon cameras: Digital Rebel, Rebel XT, 350D, 300D, 30D, 20D, 10D, 5D, 1D, 1D MK II, EOS 66, 888, 100, 100s, 500N, etc.