The black LH-49B Hood from Olympus is compatible with their M.Zuiko Digital 25mm f/1.8 lens
It blocks stray light from entering the lens, preventing flare, and offers some protection to the -
front element against light impact, should you get a little too close to your subject.
The LH-49B can be used as a spare or replacement part for the hood originally supplied w/ the lens
The LH-49B is a lens hood developed specifically for the M.ZUIKO DIGITAL 25 mm 1:1.8
Can be mounted to keep extraneous light from entering the lens on backlit shots