Companies that do topography mapping and layout work use a vacuum frame. A sheet of "virgin" film is placed in the holder. The cover is closed to draw a vacuum which pulls the film tight. Once the required vacuum is reached, a light is shown through the film to create a positive image of your picture. A negative slide is created from the positive image which will allow you to produce as many copies as required. Product Recommendations:   ECO VTF 6 107 |