There is one further difference between the 620 spools and the 120 spools - the holes at the end of the spools are different sizes. This often means that you need a 620 spool on the takeup end, because otherwise the winding mechanism won't engage properly. For that reason as well, the 620 roll might also cause problems in a 120 camera, if the camera depends on the feed spool link to ensure film flatness. I expect this would work fine in one of my Mamiya TLRs, for instance, but I'd be concerned about using it in either the inserts for my Mamiya 645s or my Koni-Omega.
Originally Posted by Frank R
While I am sure that marketing considerations played a big part in the introduction of 620 rather than using 120 instead, I think you also have to remember that when 620 was introduced, there were many more film sizes used, and the standardization we see now wasn't nearly as prevalent. In addition, the idea of people in one area of the world buying film from the other side of the globe to fit cameras that were manufactured locally would have seemed much more exotic than it does now.
I think you probably needed to be there at the time to fully appreciate why.
Last edited by MattKing; 09-08-2009 at 12:13 PM. Click to view previous post history.
Reason: added comment about 120 camera usage