I'm sorry I may be confused here especially with the European measurements, so excuse my ignorance. If your looking for 5x7" film holders (13x18cm) yes, there are a number of them out there but of course not cheap by any means: https://www.keh.com/large-format-5x...L9oKVyyFKVf4NzUlnJBEb275CdicVgaYaAn-NEALw_wcB (for example), but I am not sure what your reference to 10x145x200, is this a wide field back that has been modified to your 5x7?
Thank you. I dont think the back is modified. The dimensions are measurements taken of the film holder ”slot” in the camera back. So, if the 13x18cm/5x7 film holder is bigger than that it will not fit in the camera back.
I can not find any external dimensions of film holders available on the market. Do you have 5x7 film holder for measurements?
Modern International back fit 13x18cm, 7"x5", and half plate, holders are150mm in width. 210mm in length. Thickness can vary slightly.
Many plastic holders for 13x18 and half plate are labelled 5"x7" in the moulding, then painted with the internal film size, so you need to be careful as the paint can wear off.
These are 9x12cm and 5"x4" holders alongside each other.
The thickness of film holder can not be greater than 10mm. I measure the depth of camera back ”slot”. It is 11mm including light seal(now deteriorated though).
Ian is correct. Many of the Plaubel cameras were made with backs that take only the European "blechkasette" metal plate holders. (European cameras after all!) Those could also be used with a 13x18 cm cut film sheath. American style holders will not fit these backs. An alternative back was available for use with standard holders (like the ones Ian pictures for 4x5/9x12) but in the 5"x7" size. You may need to change the back or follow the good advice to find 13x18 metal cassettes on German auctions. I have both types of back for my 4x5"/9x12cm Peco Jr. The Plaubel plate holders are the same as the old Linhof metal ones for the 1936 9x12 Technika so if the same is true for 13x18 older Linhof metal holders may fit your back