TheLens Hood for SP 35mm F/1.8 Di VC USD and SP 45mm F/1.8 Di VC USD Lens from Tamron is designed to block stray light from entering the lens and preventing lens flare. The petal shape design of the lens hood covers exactly the angle of view of the lens without causing any vignetting. The strong and durable hood also protects the front element of the lens from impact and damage. In addition, the Lens Hood can be used as a spare or replacement.