Theo&Cleo Eyecup Viewfinder Eyepiece Hood for Canon Digital Rebel XTI T1i XS XSI T2 date 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)