Søren, it may well be that I have a roll film back & some holders that will fit your Voigtländer, let me know what size does fit.
I have a 9x12 Bergheil that came with four plate holders. There are some slight cosmetic differences in the backs but they all fit. As already stated the basic dimensions are 100 x 150 with a 7mm locating lip. The locating lip measurements are indicated by the blue lines I added to the photos. One of the holders came with a reducing insert to hold 6.5x9cm plates. That will come in handy as I have plenty of plates in that size. I don't have any 9x12 film inserts however & I'd really like to get some as I have film that I can't shoot because of this. I've nothing to trade but I do have money.
I've also included a detail of the top corner of the camera back to show the cutaway that the locating lip has to fit with. Best advice I read when first researching plate cameras was to buy one that comes with holders that fit the camera. Unless you already have a good collection of holders it can be difficult to get the right ones. Thanks to Ole for that tip.
Sorry i can't post any pictures but I don't have a digital camera yet. I have a Certotrop 9x12cm. The Certo holders are very similar in appearance to Ian's Orion/Rodenstock holders way back in the beginning of this discussion. The measurements are 100mm wide by 150mm long with a 5mm locating lip. I also have Kodak and Zeiss Ikon 665/7 holders that fit, each having the same dimensions as the Certo holders, although there is a slight variation on the way the long edges are formed. Instead of a plain flat edge, the Kodak and Zeiss holders have a groove running along each side up to 5mm or so from the top, where the locating lip would be on the Certo holders. Different appearance, same functionality.
My Patent Etui 9X12cm takes 100mm by 140mm holders with a tiny 1mm locating lip at the top. Although the overall width is the same as the Certo, Kodak, and Zeiss holders, the latter holders will not slide freely into the Patent Etui because the width of each tracking edge is fractionally larger. I am using 3 1/4 x 4 1/4 inch film sheaths because I cannot find 9x12cm sheaths here in the US. I also have been unable to find 9x12cm "IDEAL" holders for an ICA 225 and Zeiss Ikon Ideal that I also have. I keep checking the auction site and specialty dealers here but haven't had any luck. Does any one know of other sources in in this great big world that may be able to help?
All the 9x12 holder I have that will fit my Orion Werks & Rodenstock, (and scrap Ernemann) cameras will fit both my Patent Etui's.
In a couple of weeks when I'm back in the UK the idea has been to start a swap thread for 9x12 holders to pass on the spares we have that don't fit our own cameras and hopefully get ones that do in return. I'm fairly sure I have one for Søren :D
Also I'm looking at getting a few 9x12 film sheaths fabricated, they aren't difficult to make, there was some discussion in another thread. It's taken me three years of searching to find some sheaths, I only need 6 maybe a dozen more.
Ian, if you do succeed in fabricating the 9X12 sheaths, what are the chances of making a few 10x15cm? I have six double sided plate holders for my Toska 550 but have only been able to find three film sheaths (courtesy of Ole) in three years of sporadic looking. Unfortunately I am not very handy at any kind of fabrication. In addition, I am now the proud owner of an Ica Ideal 525 (10x15cm) but do not have any holders for it. I wonder how many years it will take to find those.
You've just reminded me I left an adapter with a sheet metal compan 2 weeks ago, they felt they should be easy to make. I'll check it out tomorrow or Friday.
You need 0.3/0.4mm sheet to fabricate adapters, and a former of hardened steel approx 0.25mm to simulate the film and bend the edges around. The problem I ran into was the fabricators didn't have the sheet in stock & so it wasn't economic as they had to buy a whole sheet and I needed less than 2% of a sheet to make quite a number of adapters. If I'd visited a few other fabricators I might have struck lucky unfortunately my time was limited. I did get some new blades made for a 20"x24" Beard Masking frame and that cost me £2 ($3.20) so it can be done.
My dalliance with 9x12 blows hot/cold because of weight restrictions when flying, I still need to bring a developing tank and plate holders etc, and my baggage is always over weight, but once they are here I can start using them in earnest.