Relation between Illumination and Screen Size for Non-Theatrical Projection
Methods of measuring the illumination output of 8-mm. and 16-mm. projectors are discussed, with particular reference to some of the many variables that affect the results. This output value, expressed in screen lumens, permits determining the screen size for any desired foot-candle level. But because screen brightness depends also upon the reflection characteristics of the screen material, there is presented a classification of various types of screen material. For each class of screen, maximum and minimum illumination values are suggested, with the object of keeping the screen brightness within the limits necessary for good picture quality. Charts illustrate the relation between these factors and between the screen size and projection distance.
- Print ISSN
- 0097-5834
- Published
- 1935-09
- Content type
- Original Research
- DOI
- 10.5594/J07414