The Impossible ND Film Pack Filter was developed to use Impossible film for 600-type cameras in Polaroid® SX-70 cameras.
To insert the ND Filter into the cartridge, please follow these instructions:
1. Take one Impossible ND Film Pack Filter. Note that the ND Filter has eight flaps: two longer and six smaller ones
2. Place the Impossible ND Filter on the cartridge - leave the dark slide in the cartridge.
3. Put the six smaller flaps under the cartridge-rim. The two longer flaps face outwards which locks the filter in place and prevents it from being ejected together with the dark slide or photo. Please also see the attached images that show the final position of the correctly installed filter.