- Olympus 1-7 Focusing Screen - The Olympus Focusing Screen 1-7 Microprism is a clear field accessory designed for Olympus cameras such as the OM-1, OM-2, OM-3, and OM-4. Made in Japan, this focusing screen is a unit specifically compatible with Olympus OM film SLR cameras. It provides a clear and precise focusing aid to help photographers achieve sharp images with ease. This product is a reliable replacement part for those looking to enhance the functionality of their Olympus cameras.