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Untitled edit
The film holder, with its dark slide, appeared with the first Daguerreotype camera. It meant that loading and unloading the camera with light sensitive material did not have to be done in a darkroom. Instead the sensitised metal plates where loaded into cassettes with a dark slide covering the plate, that, once fitted to the camera which is dark inside, could be exposed to the light coming through the lens.
In several languages, a dark slide is called a cassette.
In the UK, many photographers use the term dark slide for film holder
When the dark slide is in place, the film is covered, and when it is withdrawn, the film is exposed.
The original design and format of the cameras for daguerreotypy has not changed until the present day (on professional view cameras). Only slight modifications have been made. Such as the film holders having their measurements standardized at international conferences. In early cameras, each camera had different measurements and designs and film holders were part of the camera.
I put these comments here so as to make it easier to integrate into the article later. RPSM (talk) 11:41, 4 October 2013 (UTC)