Lens hoods are primarily designed to prevent unwanted stray light from  entering the lens, by extending and shading the end of the lens. A dedicated  lens hood is designed to perfectly match the specific focal length of the  lens it was designed for. Moreover, this hood features a non-glare matte  finish on the interior surface, to further prevent or limit lens flare. And  since the end of the lens is extended, you also get the added benefit of  some extra protection from accidental impact. The bayonet mount is designed  to also work in the reversed position, allowing the hood to be placed  backwards over the lens for a more compact storage solution.

JJC LH-J40 replaces OLYMPUS LH-40

Compatible models :
OLYMPUS M.ZUIKO  DIGITAL 14-42mm  1:3.5-5.6 II
OLYMPUS M.ZUIKO  DIGITAL 14-42mm  1:3.5-5.6 II R