I do not know of specialized long-roll portrait cameras here in Europe. As you indicated, markets were different.
But regarding perfs, probably the majority of 70mm still camera film was NOT perforated. I say this from my experience: in the US, at least, the great majority of school and other mass market portraits were once shot on specialized long-roll portrait cameras.
Actually that would work on any type 120 camera with closed red-window, once one has established the necessary turns of the transport knob for a frame.I suppose this will work on any camera, not dependent on the numbers on the backing-paper or systems that sense the start of the film, like the Rolleiflex Automat?
Yep, on the width of the film.
But regarding perfs, probably the majority of 70mm still camera film was NOT perforated. I say this from my experience: in the US, at least, the great majority of school and other mass market portraits were once shot on specialized long-roll portrait cameras. The "long rolls" were typically 100-ft, and there were several standard widths, including 70mm. At the outfit where I worked, we once used to process miles of 70mm film every day. And yes, it measured 70mm wide (within the ANSI tolerance), and it was not perforated.
I think this sort of thing was largely unknown in the general professional photography world, probably because it was never marketed in that direction. But certainly huge quantities of such films were used. I don't know about the specs on motion picture films.
I have it now - on reflection you statedThis thread highlights the problem with defining a film size by a particular measurement. This is most likely the reason that many film sizes were assigned arbitrary numeric codes.
Film (actually image) formats - it makes sense to describe them using dimensions.
You got it flavio 81- it is "usable" there might be lots of older cameras wich haveOn the other hand, the 70mm camera backs for the Hasselblad 6x6 cameras and for the Mamiya RB and RZ 6x7 cameras, expect perforated 70mm film.
And I had thought that the norm, for still cameras, was perforated 70mm film...
Thanks a lot for this info Mr. Bill it is veryYep, on the width of the film.
But regarding perfs, probably the majority of 70mm still camera film was NOT perforated. I say this from my experience: in the US, at least, the great majority of school and other mass market portraits were once shot on specialized long-roll portrait cameras. The "long rolls" were typically 100-ft, and there were several standard widths, including 70mm. At the outfit where I worked, we once used to process miles of 70mm film every day. And yes, it measured 70mm wide (within the ANSI tolerance), and it was not perforated.
I think this sort of thing was largely unknown in the general professional photography world, probably because it was never marketed in that direction. But certainly huge quantities of such films were used. I don't know about the specs on motion picture films.
70mm cine print film and 70mm still film are not interchangable.
Due to the tracks and, more important, due to the perforation location.
Bad news for some of us120 rollfilm has the nominal width of 2 27/64 inch.
70mm film is cut to 69,95 mm ± 0,05. 65mm film ist cut to 64,97 mm ± 0,05. ISO 3023
I know this sounds like a stupid question, since it's supposed to be 70mm wide... but 120 film is supposed to be 60mm wide, and all the stuff I have measures more like 61-62mm. Anyone have any 70mm film in their hands, along with a good measuring instrument? I've looked high and low with google and can't find a spec on this, other than some ISO specs that cost a million dollars to download. I was hoping for a Kodak tech pub somewhere, but I can't come up with one, probably because that kind of thing was settled so long ago and everyone (except me) just knows the answer by now.
Thanks,
Duncan
The international standard for film dimensions is ISO 1012. If someone is near a big library they could look it up. People supposedly respool 70mm film on 616 spools to use in old cameras. The picture size of a 616 camera is 2-1/2" x 4-1/4" while a 620 camera usually made a 2-1/4" x 3-1/4" picture on 620 film (same size film as 120) so the bigger film is about 1/4" larger than 120 film.
Bad news for some of us because
120 medium film rolls are a very bit smaler.
Yep, on the width of the film.
But regarding perfs, probably the majority of 70mm still camera film was NOT perforated. I say this from my experience: in the US, at least, the great majority of school and other mass market portraits were once shot on specialized long-roll portrait cameras. The "long rolls" were typically 100-ft, and there were several standard widths, including 70mm. At the outfit where I worked, we once used to process miles of 70mm film every day. And yes, it measured 70mm wide (within the ANSI tolerance), and it was not perforated.
I think this sort of thing was largely unknown in the general professional photography world, probably because it was never marketed in that direction. But certainly huge quantities of such films were used. I don't know about the specs on motion picture films.
I remember just as you mentioned celloulose nitrat based films - as I had an internchip/practical training for 3 weeks in a filmlab in the 80th they had to restorate old archive films on flammable nitrat base.Hi, trendland, if you assume only two per mille film shrinkage, you are at 61,39 mm. The 120 film format was defined with cellulose nitrate base and that used to shrink two to three per mille upon processing hands down. After a few years a film would have shrunk another two per mille, so one would have measured 61,2 mm corresponding to five per mille. When triacetate was introduced, a plastic that shrinks considerably less, the cutting width was altered to something slightly wider than 61 mm. Manufacturers naturally exploited the tolerance given. The problem is not the film but the backing paper. They said to themselves: the paper can bend away from the film in the camera gate and at the same time help pressing the film’s edges against it. Observe the fit between aperture/gate and pressure plate!
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