Curry
The plan-films are used in photographic rooms large size. They replace the photographic plates on glass which were still of use, though more and more seldom, until in the Sixties.
Their sizes go from 4 X 5 " (10,16 X 12,7 cm) with format 20 X25 cm (8 X 10 ") or more. These types of films are used primarily by the professionals of the photograph (and some rare amateurs). The plan-films are essential in certain branches of the photograph, for their very important sizes and thus the quantity of information presents (for the advertizing: possibility of making great pullings), like for their possibilities of almost infinite adjustment (off-centrings, rockers, infinite pulling…), architecture, macrophotography…
The plan-films are charged, in the absolute black, frames film holder which can generally contain two of them. When the first photograph is made, one turns over the frame and one has a second virgin plan-film.
The frame is tight with the light and has a shutter which one can remove once the frame inserted in the room large size. When the catch of sight is made, one positions it back after having turned over it. The visible white band is thus replaced by a black band, indicating that the film was exposed in order to avoid a double accidental exposure. The plan-films present a cutting, improperly called " perforation" , which makes it possible to the photographer to identify film and to lay out it in the good sense, i.e. sensitive face towards outside. The plan-film is a flexible film, appreciably thicker and rigid that the film in rollers. Its thickness, at Kodak for example, is of 0,18 Misters.
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