With the looming end of FP-100c and peel apart film for the existing polaroid backs there is soon to be no affordable instant film on the RB67. I’m not affiliated with this kickstarter in any way but I’m really excited to see if it will work out (I’m personally undecided on whether I should reserve one). The Instax Wide is almost a perfect fit for 6×7 (really 7×7). It looks like this adapter mates with one of the existing Polaroid back adapters, thus will not use the rotating back. However, like the existing polaroid, you should get a “squarish” image. I’m hoping to get some more clarity from the project.