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This paper describes the on-going development of a compact zoom lens specifically for stereoscopic television in nuclear environments. Custom-designed optics in radiation-tolerant glass provide a focal length of 12.5 mm to 36 mm with a package length of less than 110 mm. A novel method of encoding the position of the lens elements allows for very compact motorization, and a precision mechanism designed to overcome backlash ensures the stability of picture matching. The position of the lens elements is controlled by a 16-bit microcontroller, and the control strategy allows focus and convergence to be maintained to a high degree of accuracy during zooming.
Peter M. Scheiwiller,Sean Murphy, andAndrew A. Dumbreck
"Compact zoom lens for stereoscopic television", Proc. SPIE 1457, Stereoscopic Displays and Applications II, (1 August 1991); https://doi.org/10.1117/12.46318
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Peter M. Scheiwiller, Sean Murphy, Andrew A. Dumbreck, "Compact zoom lens for stereoscopic television," Proc. SPIE 1457, Stereoscopic Displays and Applications II, (1 August 1991); https://doi.org/10.1117/12.46318