The Nikon DK-17M Magnifying Eyepiece is a replacement eyepiece for select Nikon SLR and DSLR cameras. This eyepiece magnifies the image within the viewfinder by approximately 1.2x. This aids in confirming focus particularly when using a non-autofocus lens or if the camera's autofocus feature is turned off. A comfortable surface for the area around your eye while framing a subject through the camera's viewfinder is provided as well. This eyepiece also serves to block unwanted and potentially distracting light from entering the viewfinder. Made from soft and durable rubber, the surface of the Nikon DK-17M Magnifying Eyepiece prevents scratching and damage to eyeglasses. It mounts easily and securely to the viewfinder and is compatible with select Nikon cameras.