Shield your viewfinder from stray light when shooting in bright conditions to ensure clear view. Its large asymmetrical design makes the Canon ER-He Large Eyecup ideal when used with eye control on the EOS R3 camera, as it helps protect your cameras infrared eye sensors. The large design also makes it easier for those who wear glasses and is comfortable for wearing on both the right and left eye thanks to being able to rotate 360 degrees, with turns every 90 degrees.Weight: 25g