The lens hood offers several advantages to photographers. Primarily, it shields the lens from stray light, which can lead to unwanted color casts or a haze in the image, as well as the occurrence of lens effects. The shading of your lens enhances contrast and image quality. Additionally, it provides limited protection against moisture and dirt blown by the wind from entering the lens element, and it offers extra protection against accidental impacts. Designed for Tamron 100-400mm f/4.5-6.3 Di VC USD lenses.