keep on rolling
I have a couple of long 35mm mp film rolls. They wont fit into my daylight loader. I've tried re spooling some length so it fits but then I have no reliable way of how much film is left
One out would be to scare up a "S-83" 100ft 35mm spool, or the plastic 35mm microfilm spool. Then you can roll off enough stock to fill that, I don't know about that perverbial "last Roll" as even with the factory bulk film I sometimes get an odd size roll at the end.
(a 36 exposure roll is about 5.5 feet, - 100ft divided by 5.5 is 18.18 so you should expect to get 18 "and a bit" out of 100 ft.)
When I had the problem, I made a small jig which I marked with masking tape with the diameter of the desired roll, and wound the film until it reached the end of the rough spot containing the masking tape. My jig at that time was on a flat board that came from a Kitchen sink cutout, and the film rolls rested on the smooh surface.
I recently got a 16mm cine camera, which accepts up to 30m (100ft) of film while I have 122m rolls. I suppose this is not much of challenge, as I have this flanged daylight spools, but I can fit at most 15m in the developing tank. How can I reliably get 15m spool?
The 50ft spools for 16mm did exist but are quite rare.
I know when I use a geared rewind that about 41 turns will fill a 100 ft spool. because the amount is logarithmic, I would guess that 12-15 turns would get you close.
(I think my rewind is from the "Hollywood Film company" if it matters.)
Can you measure out 15 feet of dead film or leader? (even processed movies) counting the turns to get that on a spool would give you a good starting point.