Lens hoods protect against uncontrolled, stray light and unwanted reflections which result in reduced contrast and ghost images.
In general, the use of a lens hood is recommended because better contrast improves the appearance of the photograph. The 52mm Lens Hood will also shield the front lens element against rain and mechanical damage. The main function of the Alloy Lens Hood is to shade the lens from stray light, improving your contrast and image quality. But 52mm Lens Hood will also protect the front barrel from the inevitable impacts against walls, door frames, and other real-life obstacles and in inclement weather.
It can assist in keeping moisture or wind-blown debris off the lens.