edwinv Posted February 18, 2021 Share Posted February 18, 2021 Hi, I am testing my caemra back on a bronica and seieng that my film counter is not working. So i decide to run a dummy roll thorugh it. But i do not want to waste a real roll as i think that i will have to run a dummy roll through the back a couple of times to verify if it works. But how do i make a dummy roll ? Do i only use the backing paper fomr an existing and process roll and wind it up on an empty spool or do i reuse the now useless emulsion layer to and put it back to its backing paper (because of the thickness) and rewind both to a spool and see if the counter gear processes correctly ? (ofcourse, once i tihnk it is all again, i'll put a real roll through for ultimate test but first i need to figure out where the issue with the back is) So... how do i make that dummy roll ? Thx, edwin Link to comment Share on other sites More sharing options...
Sandy Vongries Posted February 18, 2021 Share Posted February 18, 2021 Why not buy an expired / fogged roll on line? Saw it today as low as $3. Link to comment Share on other sites More sharing options...
Niels - NHSN Posted February 18, 2021 Share Posted February 18, 2021 IMO you need to sacrifice a roll for your test to be accurate. Just shoot it like you normally would, then take it out and roll it back on the source reel by hand. Repeat... And keep it for future tests. Niels Link to comment Share on other sites More sharing options...
edwinv Posted February 18, 2021 Author Share Posted February 18, 2021 yes, not a problem to offer a roll. Just had some issues with rolling it back so i figured if just the backing paper would suffice> but agree that "closest to real" is best Link to comment Share on other sites More sharing options...
rodeo_joe1 Posted February 19, 2021 Share Posted February 19, 2021 The re-spooled backing paper should suffice to check a frame counter. It would probably have taken less time to just try it, than posting here and waiting for replies! Link to comment Share on other sites More sharing options...
Niels - NHSN Posted February 19, 2021 Share Posted February 19, 2021 The re-spooled backing paper should suffice to check a frame counter. I wouldn't know the particulars about Bronica, but you would need the thickness of the film if testing a Rolleiflex Automat for example. Niels Link to comment Share on other sites More sharing options...
stuart_pratt Posted February 19, 2021 Share Posted February 19, 2021 Run a roll through with normal exposures, rewind it onto the original spool and then eBay it as ‘pre-exposed film’ to a hipster who wants multiple exposures for ‘artistic effect’. Seriously, I’d be interested to know what it would go for. Link to comment Share on other sites More sharing options...
rodeo_joe1 Posted February 20, 2021 Share Posted February 20, 2021 but you would need the thickness of the film if testing a Rolleiflex Automat for example. Then how does a frame counter know when frame 1 has been reached? Since only the backing paper is pulled through until close to frame 1. Link to comment Share on other sites More sharing options...
Niels - NHSN Posted February 20, 2021 Share Posted February 20, 2021 Then how does a frame counter know when frame 1 has been reached? Since only the backing paper is pulled through until close to frame 1. You insert the backing paper between two rollers. Forward until the arrows point to the marked positions. Close the back. Forward the film until the two rollers feels the added thickness, and the winding is stopped at frame one. Brilliant when invented back in the mid 30's. No more red window. I have no idea how this is implemented in other cameras. Niels Link to comment Share on other sites More sharing options...
rodeo_joe1 Posted February 21, 2021 Share Posted February 21, 2021 (edited) Oh, so 'Fandom' is now the authority on camera frame-counting mechanisms? I have no idea how this is implemented in other cameras. Most use a rubber friction roller or spiked roller pressing on the backing paper to actually meter the length of film/paper that's passed. There are exceptions like the Kiev60 that just use rotations of the take-up spool, but we know how reliable they are! Edited February 21, 2021 by rodeo_joe|1 Link to comment Share on other sites More sharing options...
glen_h Posted February 22, 2021 Share Posted February 22, 2021 Oh, so 'Fandom' is now the authority on camera frame-counting mechanisms? Most use a rubber friction roller or spiked roller pressing on the backing paper to actually meter the length of film/paper that's passed. There are exceptions like the Kiev60 that just use rotations of the take-up spool, but we know how reliable they are! And, as noted earlier, you line up arrows at the beginning, as it knows the distance from the arrows to frame 1. So, I think backing paper alone would be fine. If it uses the arrows, no need to check the thickness. -- glen Link to comment Share on other sites More sharing options...
glen_h Posted February 22, 2021 Share Posted February 22, 2021 There is plenty of new 120 film for low prices, less than $5 for Fomapan 100. There is plenty of expired film on eBay, some more, some less expensive. There are also rolls of exposed film, of unknown age, some of which sell for more than unused film. -- glen Link to comment Share on other sites More sharing options...
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