70mm film,bare back darkroom rolled in a24 backs?

[eli griggs]

Has anyone had any experience with loading 70mm film, with no paper backing, lead and tail, into an A24 220 back?

I have a few of these, and rather than load 120 rolls into them, I'd rather load 70 and 35mm films, in particular 70mm.

Questions I have are, since I have a 70mm loader, how many 'clicks will give me the needed 24 frames, plus allow for either a short paper leader on the front end of the roll and none or short paper tail, since it would be loaded inside a darkroom, or loaded and changed, a light tent or bag, if dark loaded into rolled 120 spools, and carried in light tight plastic 120 roll film cans.

Any discussion of this and related topic/questions is welcomed.

Cheers.

 

[itsdoable]

First of all, you would need to trim the 70mm film down to 60mm to fit into a A24 back...

 

[gorbas]

You need 61.5mm. If you have perforated 70mm after slitting you will have 60mm or if you can cut just on one side of the 70mm and leave row of sprocket on 61.5mm. It's better situation with unperforated film. Good luck with attaching start and end paper leader on it like on 220. Yes, you can easily make 120 film from it. Let us know your results?
Big thread about 70mm film : https://www.rangefinderforum.com/forums/showthread.php?t=161383

 

[eli griggs]

Thank you, itsdoable, gorbus, for replying to my post.

I think I will simply trim to size and tape a tapered 120 paper leader, plus, and carry in pre-loaded magazines, and 120 film cans.

Since I usually put a changing bag in my bag's bottom, under any camera I have in it, that's going to be there, and my changing tent, is carried when overnighting, something I haven't done in years, but plan on in this new year

I believe my 70 mm film is Tri-X, and I'll have to check if it is perforated, later today.

Cheer's!
Perhaps some one has suggestions on available films in B&W... ?

 

[MattKing]

You will most likely need a 120 paper trailer as well, in order to ensure that the film near the end feeds correctly and stays tensioned.

 

[choiliefan]

I'm probably missing something here, but can't you use a 70mm back?
I see a couple have sold at the big site for $50-$60 range and you wouldn't have to slit your film down to width, no?

 

[Nokton48]

I'm probably missing something here, but can't you use a 70mm back?
I see a couple have sold at the big site for $50-$60 range and you wouldn't have to slit your film down to width, no?

If his Tri-X or whatever is perforated, I would buy a few A70s in good condition. And get a 70mm film reel and tank

I started a very long 70mm thread over on RFF. I suggest you look at it.
https://www.rangefinderforum.com/forums/showthread.php?t=161383

 

[k.hendrik]

For spooling/developing 70mm you can use Paterson tanks/reels too:
from 2.39'

BTW; 4x4cm and even 16mm(after some modification) can use the Paterson system.

 

[eli griggs]

At the moment and for the near, foreseeable future, my budget does no allow me to buy an A70 back or rolls, with fresh darkroom Chemistry and B&W films leading my 'must have' list.

While I may have a few Items for trades, and can occasional make a small purchase for needed kit, much of my gear is gifts, of little used cameras and odds and ends, there for off limits for trades or sales, without a prior understanding at the time of the gift camera, etc, that it could be used so.

I usually do no bring up the matter, preferring to just to accept the kit and use it... or pass it alone to someone needing a starter film camera, again, if given that option.

I do no mean to 'poor mouth' my situation, as I do have several A12 backs, so they are perfect opportunities to use, until such time as I am able to fill out more of my Hasselblad kit.

When I had my first Hasselblad kit, way back in my twenties, I had the A70 back, and it was great, and it is on my 'one day' list, for long roll films, but I can wait until the time is right to find one.

Thanks for the various tips and suggestions, I'll build a splitter and add a tail to each roll for counter tension, then post any decent images I get out of them.

Additional posts about the 'ins & outs' about 70mm in the A24 backs will be appreciated, I'm sure others have something to say about the mechanics, etc about doing this!

Cheers!

 

[k.hendrik]

OK, now I understand! happy clipping/trimming/splitting awesome 70mm film to ordinary 120 format.