Screen Illumination as Affected by Projection Lenses and Projector Optics
Projector illumination is produced by one of two basic types of optical systems, the first being the True, or Classical, Condenser System, and the second, a Source-Imaging System. Theater motion-picture illumination is not produced by classical condensers, but rather by source-imaging systems, which have specific characteristics limiting the light on the screen edge. Some of these characteristics are often produced by using short-focus lenses with a mirror designed for long-focus lenses. This produces difficulties which are not completely overcome by faster lenses. Tube sizes and spaces in projectors, meant for long-focus lenses, also frequently produce uneven illumination.
- Print ISSN
- 0898-0438
- Published
- 1955-10
- Content type
- Original Research
- DOI
- 10.5594/J14013
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