I have an abomination that I printed years ago that adapts an Instax SQ1 to Hasselblad lenses (and has an RB67 focusing screen on a viewfinder next to the Instax for composing and focusing).<p>It's sooooo impractical but the results are so fun.<p>The process is to compose, focus, put ND filter on, swap from finder to film body, half-fire the shutter, pull out the dark slide, fully fire the shutter, push in the dark slide, eject the film, rewind the shutter, and go back to the finder.