Hoodman HoodEYE eyecups link your eye to the camera by comfortably sealing out ambient light. Blocking ambient light from the viewfinder, HoodEYEs help reduce eye fatigue. You can easily upgrade your camera eyepiece in just a few seconds. Thread in mount keeps HoodEYE on your camera. Regular and Glasses HoodEYE eyecups rotate to accommodate right or left eyed shooters. Eyecups are made of hypoallergenic silicon rubber for comfort. Protective optical flat included in mount.