Mamiya Focusing Screen No. 3 M645

The Mamiya Focusing Screen No. 3 is an interchangeable focusing screen for the first generation Mamiya M645 cameras. It features a matte surface with an integrated grid, making it useful for precise focusing as well as aligning horizontal and vertical lines when composing images. The screen was designed for the original Mamiya 645 system and is compatible with cameras including the M645, M645 1000S and M645 J.