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LIGHT FILTERS, THEIR CHARACTERISTICS AND APPLICATIONS IN PHOTOGRAPHY
By Loyd a. Jones*
Outline I Introduction II Fundamental Laws:
A Reflection
B Absorption
C Transmission
III Measurement, Graph Curves, Computations
IV Filter Factor:
A Integral method B Sensitometric method C Computation of exposure factors V Use of light filters with panchromatic film :
A Orthochromatic reproduction of brightness:
Theoretical
Practical B Distorted reproduction of brightness:
General rules for enhancement of depression
Direction of distortion
Magnitude of distortion.
IN A previous communication^ the use of panchromatic film for motion picture purposes was discussed at some length. The fundamental principles involved in the photographic reproduction of the tonal scale, that is brightness and brightness differences, in the case of colored objects were outlined and attention called to some of the advantages arising from the use of panchromatic film for this purpose. The use of hght filters was mentioned briefly but no attempt was made to deal with this subject in detail. Since a thorough understanding of the nature of light filters and their use for obtaining a desired effect is essential to the attainment of the best results in the application of panchromatic film to various problems confronting the photographic worker, it seems desirable at this time to present a somewhat more complete and detailed treatment of the subject. Believing firmly in the premise that the nearest approach to perfection in the practice of a science can be attained with greatest facility and certainty through an adequate knowledge of the theoretical aspects of the subject, the first part of this paper * Research Laboratory of the Eastman Kodak Company.
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