HoodEYE eyecups link your eye to the camera by comfortably sealing out ambient light. You can easily upgrade your camera eyepiece in just a few second. The self-locking mount keeps HoodEYE securely on your camera. HoodEYE eyecups rotate to accommodate right or left eyed shooters. Eyecups are made of Hypoallergenic silicon rubber for comfort. 5 HoodEYE models fit all CANON and NIKON digital SLR cameras.