Image window

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Self-filed image mask for cinema projector FP 30. Left image window for CinemaScope, right for widescreen 1: 1.85
Image mask slide (left) in the projector, please click to display
Objective revolver of the cinema projector FP 30 with three different objectives

The image window (image mask) is a precisely manufactured metal mask that is used in photo and film cameras , enlargers , copying machines , viewers and film projectors to precisely limit the exposed or projected section. The image window is the mechanical element placed closest to the film immediately after the pressure plate so that its edges are depicted as sharply as possible.

When working with a film camera, the image window is used to determine the aspect ratio of the image when it is taken . This definition of a format right from the start was always unusual in the USA, the films were shot "unmasked", that is, the largest possible area per single image was exposed. If the film is to be shown in widescreen , it is the responsibility of the projectionist to use the correct mask.

Before and after each film recording, the lens is removed and the "lint check" is carried out, i. That is, a check is made to see whether any lint may adhere to the image window. If this is the case after the exposure, it must be repeated as all the lint has been absorbed onto the film.

Camera image window dimensions for 35 mm film

format Width in mm Height in mm
Frame 1: 1.333 24 18th
Academy (1: 1,375) 21.95 16.00
CinemaScope 1: 2.35 21.95 18.60
Wide screen 1: 1.666 21.95 13.22
Wide screen 1: 1.75 21.95 12.54
Wide screen 1: 1.85 21.95 11.86

Dimensions of the image window for projection

format Width in mm Height in mm
Frame 1: 1.333 23.6 17.7
Academy 1: 1.333 21.11 15.29
CinemaScope 1: 2.35 21.29 18.21
Wide screen 1: 1.666 21.11 12.62
Wide screen 1: 1.75 21.11 11.96
Wide screen 1: 1.85 21.11 11.33

When showing a film, the image window (the mask) is used to cover those parts of the film copy that are not to be projected, such as perforations and optical soundtracks , or parts of the image that are outside of the aspect ratio intended by the director, e.g. B. Microphones (for unmasked copies). If the presenter uses a wrong mask, the audience either sees more than they should, or parts of the film image are cut off.

Fixed format masks in the form of the recording format can be used for enlargers ; however, adjustable mask straps are often used in the negative stage. This allows exact partial sections to be determined and enlarged.

See also