Slitting 70mm To 120

[wjlapier]

In a changing bag, does anyone have a good workflow to slit 70mm film to 120? I have everything I need to do this but I'd prefer a less cumbersome method to get the film from the 70mm roll to a final roll of 120. And in a changing bag.

I'm assuming a 30-33 inch piece of film from the 70mm roll. Hoping to minimize contact with the film as much as possible so not to scratch it.

 

[guangong]

What you need is not a changing bag but a changing tent. This is what I use for loading movie film into processing tanks, slitting minox and Minolta subminiature and loading 35 mm cassettes. Some very roomy ones are available.

 

[ic-racer]

In a changing bag...I have everything I need to do this

What kind of splitter are you using that fits in a changing bag? When I used to split film I rolled it out flat and used a straight-edge and a long jig.

 

[thuggins]

Why are you limited to a changing bag? Do you not have a room that is, or could be made dark? I've lived in houses that only had small closets and one bathroom with a window, but but there were always a couple of rooms with only a single window. Tape foil over the window and wait till night.

 

[wjlapier]

The slitter is actually pretty small. It's slightly wider than the film and can fit in my hand. I've done this in daylight to see what I was doing. Too many steps to get it on the final roll. I was hoping there might be a better more efficient way--in the bag.

As for why in the bag? No room in this house can be absolutely dark for an extended period of time. Someone would complain.

 

[ic-racer]

The slitter is actually pretty small. It's slightly wider than the film and can fit in my hand. I've done this in daylight to see what I was doing. Too many steps to get it on the final roll. I was hoping there might be a better more efficient way--in the bag.

As for why in the bag? No room in this house can be absolutely dark for an extended period of time. Someone would complain.

Must be a pain to get the film the correct place on the paper because when rolling it, the tape is at the wrong end. Have you tried making 220, seems like that might be easier.

 

[wjlapier]

I have leftover backing paper and have started to leave the tape on the paper for this slitting project. Getting the film started in the right place isn't the problem. Lining it up with the paper so it rolls without shifting to one side or the other is more of a problem. Then rolling it back to another roll so it starts with the taped end first has it's issues.

220 might be the way to go. I have a lot of 220 film and several cameras that shoot it.

 

[Arklatexian]

In a changing bag, does anyone have a good workflow to slit 70mm film to 120? I have everything I need to do this but I'd prefer a less cumbersome method to get the film from the 70mm roll to a final roll of 120. And in a changing bag.

I'm assuming a 30-33 inch piece of film from the 70mm roll. Hoping to minimize contact with the film as much as possible so not to scratch it.

Does your 70mm film have sprocket holes.. I have seen cassettes of 70mm where the film had sprocket holes.. Isn't 220 film thinner than 70mm and has no sprocket holes. Why are you trying to do this? 70mm, minus the sprocket holes is already 60mm as is 120.......Regards!

 

[ic-racer]

Then rolling it back to another roll so it starts with the taped end first has it's issues.

Yes, when I used to re-load 120 to 620 spools. I would have to lift the tape and re-tape it a few millimeters farther up when re-spooling it in the correct direction. Not so much a problem with a fresh roll of 120, the tape would still stick.

 

[wjlapier]

Does your 70mm film have sprocket holes.. I have seen cassettes of 70mm where the film had sprocket holes.. Isn't 220 film thinner than 70mm and has no sprocket holes. Why are you trying to do this? 70mm, minus the sprocket holes is already 60mm as is 120.......Regards!

I have one roll that has sprocket holes ( perforated ). The rest is non perforated. Why do this? I probably have more film than I'll need for years to come, but I was thinking about what to do with the 70mm film I acquired. I did use it with a RB67 and a modified Graflex RH50 back--pulls both perforated and non perforated film. With some patience and effort I can shoot the film as is and scan and then do what ever with it. But the ability to have it as a backup to my 120 stock is appealing.

Rollei 400 @ 70mm:




This is Portra 400NC @ 70mm:

 

[Meyer Trioplan]

Somewhat tangential but I’ve pondered why it seems no one has ever tried to sell 50-100 foot rolls of 61.5mm film. With the extra finishing costs and supply chain challenges of getting backing paper, combined with the number of home developers who might reload, it would seem that there might be some market that would like to restock their 120 from fresh film and salvaged materials.