The Mamiya C3 is a medium format twin-lens reflex (TLR) camera introduced by Mamiya in 1962. It uses 120 roll film to produce 6x6 cm square images. The camera features interchangeable lens units, making it unique among TLRs, and supports a range of Mamiya Sekor lenses. The C3 has a bellows focusing system, allowing for close-up photography, and a focusing knob with a distance scale. It includes a waist-level viewfinder and accepts interchangeable focusing screens. The Mamiya C3 is notable for its robust build and modular design, catering to both professional and advanced amateur photographers.