Lens hoods are primarily designed to prevent unwanted stray light from entering by extending and shading the end of the lens, ensuring no problems with vignetting or motor functions.
Compatible with 70 to 300mm f4.5 to f5.6 DO-IS lens 
Designed to prevent unwanted stray light from entering the lens 
Ensures no problems with vignetting or motor functions 
Added benefit of extra protection from accidental impact