The Olympus OM System Focusing Screen 1-11 is a genuine Olympus product designed for Olympus cameras. This focusing screen, made in Japan, is compatible with the Olympus OM system and has a maximum aperture range of 1-11. It is a crucial component for photographers who want to achieve precise focusing and composition in their images. The focusing screen offers a reliable and high-quality solution for capturing sharp and well-framed photographs with Olympus cameras.