This Zenza Bronica ETR 6x4.5 120 film back is compatible with Bronica ETR, ETRs, and ETRsi 120 cameras. It allows you to take 4 exposures and is perfect for film photography. The film back is crafted for 6x4.5 cm camera size, ensuring high quality pictures with every shot. Whether you are a professional or an amateur photographer, this film back is a great addition to your camera gear.