Speed Of Lenses
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✎ Suggest a correctionPresents the scientific nature of lenses in connection with light. Explains the diameter, diaphragm and focal length. Shows the factoral system and hour calculated together with the American Standard series.
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Sources
- A-V Online (National Information Center for Educational Media). CD-ROM database of educational and documentary media, compiled and maintained by the National Information Center for Educational Media (NICEM). — title, creator, length, format, sound, description
- 16mm Filmography (legacy record) — catalog record
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