I have converted a 150 and a 110a, it is not hard. There are several good sites on line with step by step directions. There are several ways to come up with the new back, the 103 backs are the best but most expensive. The 150 I cut the back off a cheap plastic camera, just make sure the back has rollers instead of spreader bars. Hacksaw and files are all I used except cutting the plastic back and a rotary tool works great.