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35mm Film on 120 Spool

By coconnor55

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coconnor55
coconnor55
almost 8 years
Vinz, Most 120 cameras have a red window on the back for 120 film which shows the frame number printed on the paper backing of 120 rolls. Cameras that support 220 film don't have a red window since that would expose the film and use a film advance counter instead. Often there is a pinch roller that drives the film counter but since 35mm film is so much narrower than 120, it doesn't engage the pinch roller. That looks to be the case for the Mamiya 6 from what I can tell in photographs of the open back. You will just need to load the 35mm film with 3 turns on the takeup spool, mark the exposed portion with a marker, and count how many lever winds are necessary to advance past the exposed portion with at least 1/8" between frames, and remember it for future use. You will know when you reach the end of the 35mm film because you will feel the resistance to winding. Don't force it. At that point, you unload the camera in a changing bag or darkroom and wind the 35mm film all the way back in for processing (I don't know of a 120/220 camera that supports rewinding).
vflacher@gmail.com
vflacher@gmail.com
almost 8 years
Hello Clint, I printed it today and it's looking very good ! Except that I can't figure out why the film counter does not advance when I try to load a 35mm film with it on a mamiya 6. Do you have any clue ? Thank you for your help, Vinz
3d-drucker-boy
3d-drucker-boy
over 9 years
What measurements do you mean, I think they are all known
christian.bermudezrodriguez
christian.bermudezrodriguez
almost 10 years
Hi very good contribution, I would like to print it but ask me the measurements of each piece, could say them thanks
edtse88
edtse88
about 10 years
Hmm yeah I'll try to file down some parts of the one I have now. But again, it seems to work in some cameras better than others so just a disclaimer to those who want to try this out. Don't force the winder if it's stiff!<br><br>And I don't update my blog enough haha but I thought this was worth posting!
coconnor55
coconnor55
about 10 years
Great blog! I think I know what the problem is now on friction and will do a new version and send you the files. As for the holes, they might be smaller if the first layer is really squashed down in printing.
edtse88
edtse88
about 10 years
Thanks! But I don't think that's the problem, it might just be my autocord. I tried winding it on my rolleiflex and it worked fine. On the autocord, I think the tightness was in the diameter of the holes. Also, I have an adapter on my rollei for 35 mm but it doesn't expose the sprocket holes but if I use parts of it, it will allow rewinding of the film in camera. Unfortunately this mechanism wouldn't work in other cameras. I made a post here with more info: http://www.edtse.com/35mm-to-120-film-adapter/
coconnor55
coconnor55
about 10 years
I measured 120 spools with a caliper but maybe I'll take 1/2mm off each end. I'll send it to you in a week to try out. &nbsp;You're correct that some 120 cameras can't rewind 35mm and have to be opened in a darkroom. &nbsp;I'm going to have to put an extra knob on my Flyer to enable rewinding.
edtse88
edtse88
about 10 years
Nope, its 120. It's definitely a tightness, I know that if I force it, it will move but obviously that's not ideal. I'll try to see where the resistance is and let you know. What camera did you use it on? Also, on my Minolta there is no way to unwind the film without removing the back in the dark. My rollei on the other hand has a rewind knob which makes things easier. I guess this is a problem that you will have to deal with depending on the camera.
coconnor55
coconnor55
about 10 years
edtse88, could it be that your Minolta Autocord is a 620 film model? That could account for the jamming. If not, please let me know what you find out and I'll redesign it - or create a new version for 620 film.
edtse88
edtse88
about 10 years
Hey! Thanks for the design, I printed one and here are the results: https://www.facebook.com/media/set/?set=a.10152065105532531.1073741834.505987530&type=1&l=1e1f2ea351 The adapter had some problems in my camera though (Minolta Autocord). I think the adapter fit too tightly and the roll jammed after a few shots and I had to open the back to wind it. I'm going to try to file the adapter down a bit and see if it helps.
Supershawn
Supershawn
about 10 years
Awesome!!!
coconnor55
coconnor55
about 10 years
You can get them from me at pinholeprinted.com/order if you don't have a 3d printer yet.
Supershawn
Supershawn
about 10 years
Ok how do I get one of these? I do not own a 3d printer...
coconnor55
coconnor55
about 10 years
Appreciate the Likes!

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camera 35mm 120 film medium format film adapter 35mm to 120

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