The ESC-EF Eyecup from Vello is a replacement eyepiece for select Canon cameras that provides a large, oval eyecup for more comfortable viewing through the viewfinder. The large shape of the eyecup improves the image quality in the viewfinder by sealing out all extraneous light. It can rotate 360? to accommodate both the left and right eye and horizontal and vertical shooting positions. The eyecup extends from the viewfinder, blocking stray light and providing a clearer image. The soft yet durable rubber design is comfortable for those who do not wear eyeglasses and will not scratch or damage the glasses of those who do. It mounts easily and securely on the camera's viewfinder.