DIY Film Packs possible ?
I just got a 45x107 Kosmo Clack Stereo / Panoramic camera. It came with several holders, each good for one glass sheet. It also came with a Film Pack Adapter. I am certain of it's identity. I've never used a Film Pack, and can not find out how they were configured via google. I'm guessing there is not much to them other than paper & film. I guess 120 paper could be cut & taped to make a usable film pack.
Can usable film packs be made from cut or roll film ( 120 in this case ) to make something for use in obsolete film packs in obsolete formats ?
What is the configuration of the contents of a film pack ?
This seems like a very tedious project, but you could find an old film pack and dissect one to verify this. In fact, I think you would have find one for this format, so you can "refill" it, and I've never seen a 45x107 film pack. The film has to be thin to work, so rollfilm rather than cut film.
Since others are not already blabing about doing it, I suspected the solution would be pretty horrible. I studied the Film Pack Adapter some more. I can drive out the hinge pin and remove the back cover. I swear I can hear a Lubitel 166 ( with a broken viewing mirror ) crying out "Kill me now please." Chopping up Lubitel parts for a "home brew" roll film back, and somewhat similar carving of rolls of 120 film, could be a slightly less messy solution. I'll hold off untill I get some much better projects out of the way. Eleven itty bitty plate glass holders came with the camera. I'll try making some backing pieces to put film on top of and load as plates.
You could cut some sheets of glass to the appropriate size and just put it behind the film.
Doh !, Interface of the "Film Pack Adapter" is so simple, a third Idea occurs.
Scratch build a crude roll film back using the Lubitel as donnor, and use unmodified 120 film. Don't know why, but apparently I've got to yack somewhere before a near reasonable solution occurs.
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That's what I was thinking of, depth of film holders seems too little for
Originally Posted by David A. Goldfarb
1/16" glass, Chased around on the web and found a source of thin stuff.
As best I can measure, and from what I found via google 'thin glass'. 1.2mm thick glass would be best. It occurs to me now that Perf Board, used for cobbling electronics projects, is pretty stiff and thin, if it is thin enough, it's what I'll use.
Depth was determined by placing dime and penny in holder, slide would close over penny with NOTHING to spare, and holder has 4 tab springs near corners to push glass foward. Dime thickness looked usable.
US Coin - Penny Nickle Dime
Weight - 2.500g 5.000g 2.268g
Diam. - 0.750" 0.835" 0.705"
Thickness - 1.55mm 1.95mm 1.35mm
and 1/16" = .0625" = 1.5875mm
Doh! Doh! Doh!
Small circuit board chunk I found, is thick as a penny.
CD is thinner & covers this small format, slight ridge on data side, probably spaced with tab springs of plate holder, wont even have to sand ridge off.
CD completely covers 4.5cm x 10.7cm format. Looks like I'm going to
have to sacrifice 1025 Free AOL hours for each of 11 backing pieces. THANKS AOL.
Normally, I'd say take that to hybridphoto.com, but I think we can allow this use of digital technology on APUG.
1 of 11 done. I drew a template to lay CD on for scoring, scored each side 5 times HARD, printed side first, then chucked short sides along score line in vice and bent back & forth to break on line with fatigue. Chucking long side in middle on vice with hang out on both ends was mistake. Align long side to one edge, fatigue that side untill weak than shift and fatigue other end of line for straight break. Hoard of AOL disks was inspired by ( playing ) card throwing record of 216'. I presume CD disks could be digital version of James Bond movie Goldfinger villian Odd Job's hat, but real.
Finaly found what I wanted to know about film packs. I'd known about USPTO and certainly freepatentsonline came up with numbers to put in USPTO, but I could not find what I wanted. Mostly light trap variations were coming up.
What I found that worked was
In Google click "more" click "patents" entered "film pack" 1907, 1909 etc patents came up, text and images.
Entire path is simple U shape with apex at far end from pack opening. far end of each full length paper tab/back is tacked with a thead so only the tab being pulled tears and comes out and rest of pack does not jam / come out. film is taped across film tab / backer at films leading edge. A leaf spring pushed pressure plate in the middle pushes the layers of unexposed film piece and their tab / backers against the pack opening originaly protected with a tab/backer that did not have a piece of film taped across it. There is no pressure against the exposed film that is drawn around the U apex to the area at the back of the pack behind the pressure plate and it's spring. Film & tab / backer sheet in area behind film is wider than the portion of tab / backer that is drawn out of the Film Pack Adapter.