Not enough tension on film roll before closing camera??
Not enough tension on film roll before closing camera??
Loose film in the takeup is usually caused by not keeping the film tight as you load in the takeup spool. Some cameras have a friction roller on the film side to hold the film supply roll. Fuji rangefinders are notorious for slack film on the takeup spool if you don't follow the clear directions in the manual about holding film tension on the supply roll qs you close the door. If there is any rise or bulge in the film across the film gate, you'll get slack on takeup.
While I know this is a problem on Fuji 120 early rangefinders, I don't specifically know about the Bronica.
I once saw it bad enough that the film roll bound up in midroll and I had to open the camera and fish the roll out. Since that episode, I am very cautious and use all the hands I have available to keep the roll tight coming off the supply. I have not had this problem with any 120 roll film in years, but I load every roll as if it may happen.
I think the mechanics of the problem are this:
If the film is bulged or not down flat on the film gate, when you close the door the bulge is pushed as slack onto the takeup spool and starts to form a "wad" or loose bulge on the roll. That bulge grows with each crank of the winder arm. Making sure the film is tight across the gate, which always involves holding one finger on the supply roll while tightening the slack out with the winder, prevents the stack from starting. I hold one finger on the supply roll and the other hand on the winder keeping tension as the film door/film platen comes down on my supply roll finger, then gently slide the finger out and close/lock the door in one deft and almost superhuman move. Your toungue should just be sticking out of the right corner of your lips and bite tension just on the threshold of pain.
OK, forget that last little bit, but I am dead serious about maintaining tension on the roll throughout the loading process.
