The Mamiya RB67 Pro-S is a medium format film camera that was introduced in 1974 as an upgrade to the original RB67. It is a highly versatile and professional camera that is widely used in the world of medium format photography. The RB67 Pro-S features a modular design, allowing for interchangeable lenses, viewfinders, and film backs. It has a large, bright waist-level viewfinder that provides a clear and accurate image. The camera uses a bellows focusing system, which allows for precise focusing and the ability to use various extension tubes for macro photography. The RB67 Pro-S also has a built-in motor drive option, enabling rapid film advance and continuous shooting. With its robust build quality and exceptional image quality, the Mamiya RB67 Pro-S is a favorite among professional photographers and serious enthusiasts.