Very likely they used the larger than regular sized Polaroid such as that found in the 95 and 110 series cameras. Size would have been 3.25 by 4.25 inches. The

Very likely they used the larger than regular sized Polaroid such as that found in the 95 and 110 series cameras. Size would have been 3.25 by 4.25 inches. The b&w film would give a very finely detailed image.