The Mamiya 645 is a medium format film camera that was first introduced in 1975. It is known for its modular design and versatility, making it a popular choice among professional photographers. The camera features a 6x4.5cm format, which is larger than 35mm but smaller than traditional 6x6cm medium format cameras. It has a built-in light meter and a waist-level viewfinder, as well as interchangeable lenses and film backs. The Mamiya 645 offers excellent image quality and is suitable for a wide range of photography genres, including portrait, landscape, and commercial photography.