Olympus Vari Magnifier Right Angled Finder, suitable for Olympus OM series 35mm film cameras but will also fit Pentax K and M series 35mm cameras as well.
Ideal for macro/close up photography when you have the camera on a tripod close to the ground, also useful when used with macro bellows units or for when a camera is used on a copy stand.
Two magnification settings via a switch on the side of the finder, 1.2x and 2.5x.