There were also Polaroid backs designed for a number of medium format cameras such as Hasselblad, but of course it didn't fill the entire film area, and Polaroid made a back to use the pack film in 4x5 view cameras. This particular back was often used to "convert" the pro rangefinder equipped 110 seies Polaroid roll film cameras to use pack film. The final 110 model, the 110-B, had a fantastic 127mm f/4.5 Rodenstock lens. Older ones had Wollensak optics.