One of the greatest time and money saving devices available. The Polaroid Film Pack Holder is indispensable for checking exposure, composition and lighting, especially fill flash. Invaluable for instant proofing of images for art directors and clients. Fully meter coupled with Pro AE Prism Finder. An absolute must in elaborate settings where the shoot cannot be duplicated. Accepts 600 series Polaroid pack film. For 645 Pro, Pro TL & Super N2 adapter required for tripod use