Working on an external power power supply for my Pentax 645. This is the first prototype! Total cost has been less than $20 which is a lot cheaper than buying an external
Pentax 150mm f/2.8 smc PENTAX-FA 645 Autofocus Lens for Pentax 645N, Black {67} at KEH Camera
Contax 645 vs Pentax 67 vs Pentax 645 vs Hasselblad H2 vs Mamiya 645 | Contax 645 Alternatives