I tried cutting a 220 back in half to get a 120 back, but instead it became a 110 back, and that didn't work at all...
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What even is a 220 film?
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+1
The RB67 preasure plates are the same in both 120 n 220 backs. If your film is jasmming, your back needs service.
The leaders of 120 vs 220 are different lengths n the start is different.
The frames will get very close by the end of your 120 in a 220 back... No backer compensation, diam of the roll on the pull is tighter n smaller.
The leaders of 120 vs 220 are different lengths n the start is different.
The frames will get very close by the end of your 120 in a 220 back... No backer compensation, diam of the roll on the pull is tighter n smaller.
The plates might be the same but the gap they leave for the film to pass through will differ. This is controlled by the height of the outer rails which the plate rests on.
Contrary to what its name suggests, the pressure plate does not apply pressure to the film.
And that shoudn't make any difference as most film backs rely on a wheel which rotates as the film passes and stops the wind on after a fixed film length rather than a varying number of turns of the take up spool.
Steve.
I think I've had one through my 220 blad back too long ago to recall.
At what point did it jam as the 120 and 220 leaders are the same apart from one is a few cm longer so you should have got to stage you needed a dark bag to rescue the 120?
OP
OP
It never got past the paper. Instead all the film unraveled and bunched up on one side
Ok if you have not loaded a blad back before you may need to feed the paper under the silver edge clip try google for loading a blad back, I think the 220 back is the same, but my kit is not to hand.
Not true... For RBs anyway. The difference is the wind n counting mechanisms in the inserts. There is no gap, otherwise your film will not sit flat. The spring applying preasure has no idea what is running under it n doesn't care.
Why other brand cameras use different plates??? Maybe a built in link to signal the mechanisms to switch counters n winds so its an all in one back?
Regardless... It would be nice if film makers would bring back 220.
The RB motor drive backs came with a pair of swappable backs for 220 and for 120
The (mamiya) TLR back rotates through 90 degrees for 120 and 220.
So the backs do bottom on datum points but allow the film or film and paper to wind on freely.
Almost. There are instructions on internet about how to load 120 film in a 220 film back (check Google). There is the assumption that you'll only get 11.5 shots instead of 12, maybe due to the fact (or fiction?) that the spacing between 2 frames is wider on a 220 back. To test this I loaded my new 220 back with an old film, removed the dark slide an wound the film. I marked each frame with a pen to see what I'd get. I did get 12 normal frames with enough film left at the end. And the spacing between two frames seemed normal.
Maybe I was lucky but I would suggest to try it once before trading the back and losing money. Just wind slowly.
The only hypothetical problem could be that the film is pushed too much forward by the preasure plate, thus not getting sharp images. I have a Hassy SWC and this camera has a veeeery small DOF behind this special 38 mm lens. I'll play "Myth Busters" sometimes to see if this is true.
BTW, I recently got me some Velvia 50 in 220 format and still have some Fuji NPC and Provia in 220 format. A total count of (about) 60 rolls so I good for now
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Sure there is. If the pressure plate actually applied pressure to the film, you would have difficulty winding on. The pressure plate sits on the outer rails and this leaves just enough gap between the plate and the inner rails for the film to pass through. Backs which are 120/220 have a means to adjust this gap depending on the film used.
Have a look at the diagram again:
Steve.
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A common approach in the design of pressure plates is to have them arrest spring loaded at a distance from the frontal film-guiding rails. Thus forming a gap indeed.
Film even 35mm does not sit flat it tends to move away from the pressure plate.
Some roll film backs don't pre kink film before the exposure gate and give more repeatable results...
No one was buying 220 so you won't see it again.
I am sure that this has been asked in that big Ferrania thread...somewhere...but does anyone know if Ferrania has 220 confectioning equipment?
I've been shooting 120 film with S camera designed for 130 rolls which are significantly wider. I have done nothing to support the film and the edges don't show any signs of curling or spacing issues at all. The pictures are sharp even with a meniscus lens. I just don't think the difference in the thickness of a piece of backing paper will affect anything when going from 220 to 120.
120 film has paper all the way through it but 220 film has paper for part of so it has to allow for the thickness of both the pass through anyway.
I wouldn't stress over plate distance if all i had was a 220 back.
Typos made on a tiny phone...
120 film has paper all the way through it but 220 film has paper for part of so it has to allow for the thickness of both the pass through anyway.
I wouldn't stress over plate distance if all i had was a 220 back.
Typos made on a tiny phone...
[h=2]What even is a 220 film?[/h]That's easy... 220 film is precisely 100 more than 120 film and 85 more than 135 film.
That is not the problem instead if Kodak could not sell 220, why do you think Ferrania can?
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Another thing to consider is that 120 and 220 have different length paper leaders and trailers. I gave the numbers in my first post on this forum, about using 220 film in a Kodak Monitor designed for 620. If this has been covered elsewhere in this thread my apologies.
If somebody made 220 in B&W, I would use it!
And me !!
Could use it for my Hassy SWC, Mamiya C330f, Bronica RF-645 and Yashica Mat 124G.
MattKing
Moderator
Simon Galley has stated that the backing paper for 120 film costs them more than it costs Ilford to produce the film.
And that the minimum order amounts for the leader and trailer for 220 film were huge.
Just think what the relative cost would be for the backing leader and trailer for 220 film.
And that the minimum order amounts for the leader and trailer for 220 film were huge.
Just think what the relative cost would be for the backing leader and trailer for 220 film.
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