Supplemental illuminating of film plane in photographic cameras

Abstract

Abstract Facilities are provided for introducing additional light supplementing or varying the exposure of a piece of film at the same time that it is being exposed to light from an object forming an image on the film. One way this is done is by admitting light from the same source through passages around the lens mount to the film frame area. This light is admitted through holes drilled through the housing around the lens mount, which holes may be left open or may have small lenses, or color filters, inserted in them. Preferably, however, such holes or bores are filled with bundles of light transmitting fibers. Held close together in the holes, the fibers may be separated on emergence at the inner ends of the holes for maximum distribution of the supplemental light transmitted by them over the exposure area. The supplemental light transmitting devices increase the effective exposure of the film with respect to the radiant energy coming from the object available, without the invention, to produce the image. They also enable special effects to be produced in a variety of ways: for example, the color balance of multilayered color negative films may be altered; the apparent contrast of the developed image may be changed and various other controlled changes may be introduced with respect to the recorded color images. Diaphragm means, such as relatively rotatable overlapping perforated annuli, may also be used to control the supplemental light in various ways. Supplemental light may also be admitted through passages at other positions.

Inventors

• 👤 Herbert E Bragg

Bibliographic Details