Eyecup Eyepiece for Canon Rebel Xsi Xt XTI 20da 500n "New generic Eyepiece Hood for Canon 450D 350D Eyecup Viewfinder, Black Quantity: 1 Attaches to the viewfinder eyepiece minimizing extraneous light and vision fatigue The Eyecup provides cushioning around the camera's eyepiece, and is especially useful to eyeglass wearers It makes the viewfinder readout easy to see even on a bright and sunny day Also prevents eyeglass lenses from getting scratched. Makes shooting more comfortable Dimension:40mm (L) x 24mm (W)x 10mm (H) Accessory Only"