Been prototyping an instax “back” for the pentax 67. Basically replaces the rear door. I gotta say, I love how sharp instax is, when using a proper lens. : r/instax
Exc+4 : READ Pentax 6x7 Medium Format Camera Modified to Polaroid Back from JP | eBay
Polaroid Film Back (For Pentax 67)
Polaroid Camera Kit with Film | Vintage cameras, Classic camera, Photography camera
Pentax 6x7 MLU Polaroid/back door - PentaxForums.com