The F3P was made (I think) for cold weather use. It is like a standard F3 HP but has better weather sealing, raised controls and a hotshoe. The standard film back is the MF-6b, which works with the MD-4 motordrive and leaves the film end out when you rewind. If you do not want to use an MD-4 you may prefer to swap the back. This camera is completely unused in the box with instructions. We put in batteries and works perfectly.