This camera eyecup is specially designed for Nikon cameras. It can be extended slightly and put on the viewfinder eyepiece to provide a little protection from impact and scratch, but it also blocks the light entering from the peripheral of the eye when shooting, making the viewfinder image more visible and supporting shooting. The soft silicone material allows you to take photos with the naked eye or when using glasses. Compatible with Nikon DK-28 / DK-25 / DK-24 / DK-23 / DK-21 / DK-20 eyecups