The Canon LH-DC70 Lens Hood is designed to prevent unwanted stray light from entering the lens of your Canon PowerShot G1 X digital camera.
This lens hood provides multiple functions:

• it shades the lens from stray light, improving your contrast and image quality
• in inclement weather, it can assist in keeping moisture or wind-blown debris off the lens
• it protects the front barrel from the inevitable impacts against walls, door frames, and other real-life obstacles.