GB395366A - Improvements in or relating to apparatus for use in colour cinematography - Google Patents

Abstract

395,366. Colour kinematography. EVANS, J., 40, Upwood Road, Lee, and GIBBON, S. H., 57, Lauderdale Mansions, Maida Vale, both in London. Jan. 12, 1932, No. 964. [Class 97 (i).] A rotating filter carrier for a camera comprises a light green filter 7 having blue and yellow filters 8, 9, respectively, at its ends, and an orange-red filter 10 having a yellow filter 11 at the end towards the yellow filter 9 ; clear spaces 12, 13 may be provided adjoining the yellow filters and shutter blades 14, 15 may also be provided. The angular measurements of the filters &c. may be as shown in the Figure, the exposure through the light green and associated filters being, consequently, substantially longer than through the other filters. The filters may be of optical gelatin, and may be secured by plates 14, 15, 17 and screws 16 to a back-plate which is apertured to form windows and serves as a shutter. The Provisional Specification sets out different angular measurements for the filters, and describes a shutter for use in projecting films taken with a filter shutter as described above. The projection shutter may have blue-green and orange-red filter segments intersected medially by opaque elements, and either with or without a third colour, e.g. yellow, at their leading and trailing ends. Alternatively, an orange filter and a red filter may be provided on opposite sides of one opaque element, and green and blue filters on the opposite sides of the other opaque element.