Lens hoods guard against uncontrolled, stray light and unwanted reflections, which result in reduced contrast and possible "ghost images". In general, the use of lens hood is recommended because better contrast improves the appearance of the photograph. Lens hood also protect the lens front against rain and mechanical damage
2.It can protect the lens from being scratches
3.Shades lens from stray light, improving your contrast and image quality.
4. Reduce influence of exceeded lights & Increase transparency and color restore
5.Assist in keeping moisture and wind-blown debris off lens in inclement weather 6.Protects front barrel from inevitable impacts against walls door frames obstacles