The (red) window will reveal the next number when you have advanced the right amount. After you develop the film you can examine the backing paper and see the numbers are staggered to line up behind red windows in different places on different cameras. (Cameras that have inserts to do 6 x 4.5 may have two windows, you advance first to the one window and then to the next window.)
Bill-
Thanks for the help, that makes sense.
This is my first experience with 120 film and I'm a bit confused. The film I have didn't come in any sort of protective container, it was just wrapped around a spool. Once I've exposed all of the film, should I just pull out the take up spool (which now has my exposed film wrapped around it) and put it into some sort of lightproof container to bring to my photo lab?
you should find some red celophane and put it over the window so you don't have to tape it up. Alternately, the black backing paper on film is actually pretty light tight, if you find a deep shadowy place where you can lift the tape in relative darkness and only have it up enough to see the numbers go by as you wind, it will work.
but red clear celophane is your best bet. local hobby shop will have yards of the stuff.
I always wondered how 645 people measure the distance since they don't display that numbering.
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