The Panasonic DMW-EC6 Eyecup blocks light leaking into the viewfinder. You can attach the eyecap on the LUMIX S1 and S1R mirrorless cameras. The eyecup is ideal to use when working in bright lighting. You can turn the eyecup 360° for using the camera from the left as well as the right eye. The anti-station material of the eyecup resists dust.