I thought I had this bastage sussed. I thought I taped up the back plane quite well but it was only parcel tape. I definitely need duct tape now to rule out that backdoor. I’ve tightened the lens mechanism as much as I can, blacked out with a glue gun and black acrylic paint any potential crack around the adapter for the 120 canister and the 120 canister itself but light still seeps onto the roll and it does run across frames which says to me it must be the 120 canister.
Anyway, here’s the three fargin pictures that came out:
Why these ones come out and the others didn’t I can’t honestly say.