The EPS-EP18 Eyecup from Vello is a replacement eyepiece for Sony a7 Series, a9, a99 II, and a58 cameras that provides a large eyepiece for more comfortable viewing through the viewfinder. The large shape of the eyecup improves the image quality in the viewfinder by sealing out extraneous light. 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.