Bronica SQ back film registration

Another question is the frame registration. Some say the 120 leader is longer and others say it is shorter than the 220 leader. Since I did not have any 220 film, I cannot say. Let see if we can figure this out... I roll my own 120 film. I have some spare film and some spare backing paper laying around. What I did was run the same roll of 120 film through both the 120 and 220 back. I removed the dark slide and marked the location of each frame. In the photo, the left or blue marking is from the 120 film back. The right or red markings are from the 220 back. I lined up the start marking of the 120 film with the red start marker on both the 120 and 220 back inserts.

 

As you can see, the registration of the 120 and 220 back inserts are fairly close. I would attribute the difference to the positioning of the start mark and the tension of the film. I would say it is quite acceptable and twelve exposures will fit tidily on both the 120 and 220 film back.

 

Myth Busted- 120 Film will register correctly in a 220 film back.

 

- This is part of the set 120 Film in Bronica SQ 220 back. -

Done