A New Automatic Iris Control for Motion-Picture Cameras
The Bell & Howell Company's new Design 200-EE camera incorporates a self-powered compact automatic iris control. Mechanical power to drive the lens iris originates from a small direct-current, permanent-magnet motor driven by mercury batteries. A photovoltaic cell deflects a relay meter according to average scene brightness, and opening or closing the motor-battery circuit causes the lens iris to be properly positioned. The camera and its method of use are described.
- Print ISSN
- 0361-4573
- Published
- 1957-07
- Content type
- Original Research
- DOI
- 10.5594/J13879
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