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polaroid roll film has been dead since 1990. I went ahead and converted one to shoot on Fuji Instax Wide. you have remove the back and metal frame around the film plane, cut a good chunk out of the camera body, attach a Lomo Belair Instax back (upside down), modify the front standard because you moved the film plane back (not too hard if you use a ground glass or tracing paper). Not really for the faint of heart, but produces great results due to the coated tessar lens. Composing is still somewhat dodgy due to the instax wide fame being about 3/4 of what the polaroid frame was
Pic related, my conversion