I'm in the process of converting a Polaroid 800 to 120 negative roll film.
I'd like to keep the width of the original Polaroid formant (4-1/4"). Since
the paper backing on 120 roll films does not have markings for this width,
I'm not sure what to do about frame counting. THe only idea I've come up
with is to measure off the frames on a junk roll of film, and count how many
rotations of my wind knob it takes to advance one frame with adequate
spacing between frames. I realize that as the take-up reel fills up, the
ratio will change, but if I used the maximum number of turns ( the number it
took to get from frame one to frame two) I'd be save. does anyobne have any
other ideas?
Also, I'd love so share ideas with anyone who has done such a conversion.
If the 150 works out, I'll convert my 110A. The 150 was cheap, making it a
good test bed.
Jeff.
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