Sony ALC-SH0007 Overview
The dedicated Sony ALC-SH0007 Lens Hood is specifically designed for use with the 75-300mm f/4.5-5.6 and 100mm f/2.8 lenses.
Lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens. In addition, since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact.
This dedicated lens hood is designed to match the specific focal lengths of the lenses it was designed for.