This Dedicated lens hoods is designed to match the specific focal length of the lens it was designed for.
This Tamron Lens Hoods is designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens and also offers the added benefit of some extra protection from accidental impact on the glass as well, since the end of the lens is extended.
Compatible with Tamron SP AF180MM F/3.5 Lens.