For reducing the camera's lens focal length to 0.75x.
Extend the ultra-wideangle perspective to shoot all the way out to 18mm (35mm format equivalent) focal length.

Should be used with UR-E14 lens adapter ring.
Use HN-CP12 supplied lens hood to take pictures of backlit or semi-backlit subjects. The lens hood eliminates "ghost" images which tend to occur when there is a bright light source around the frame of a picture with backlight or semi-backlight (diagonal backlight).