how do you use them with instax film?
Haven't yet..

Some thoughts..
As you probably all ready know, Instax mini film will fit a medium format standard film holder, one shot for each side.
https://www.photrio.com/forum/threads/instax-mini-film-fits-2-1-4-x-3-1-4-film-holders.156089/
Were experimenting with instax wide film, which size is about 3.3/8" x 4.1/4.
This can easily be placed in a specially cut old exposed 4x5 negative. to be used with a 4x5 camera
Note*** In the Utube video, in his demonstration, the Instax wide is place incorrectly incorrectly, the black side has to be facing the lens, and of course all this is done in the dark.
Now onto the 3x4 ...
Its smaller and lighter, so want to try to shoot instax wide film in it, problem is the Fugi instax is to wide, will not fit in a 3x4 film holder, but it will fit into a Graphic Film Pack Adapter #1233, which has an opening inside of about 3.5 x 5"
So it will take a glass plate or instax Wide film, but one has to make the Adapter light tight, as at the dark slide pull end, there is the opening that was used to advance the film in the original film pack to the next shot.
So we got some foam board that were going to experiment with, to make a light tight environment
Just haven't gotten to that adventure yet.
