The Contax 645 is a medium format film camera that was introduced by Contax in 1999. It is a popular choice among professional photographers for its exceptional image quality and versatile features. The camera features a modular design, allowing photographers to interchange different components such as the film back, viewfinder, and lenses. It has a 6x4.5cm film format, which offers a larger negative size compared to 35mm film cameras, resulting in sharper and more detailed images. The Contax 645 also boasts a reliable autofocus system, making it suitable for both studio and on-location shoots. With its ergonomic design and intuitive controls, it is a pleasure to use for extended periods of time. Overall, the Contax 645 is a reliable and high-performing camera that is favored by professionals in the fashion, portrait, and wedding photography industries.