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lens operating lever. During a zoom, when the motordriven arm contacts either switch, power to the motor — (3) in Fig. 1 — is cut off, stopping the zoom operation. If desired, the zoom can be stopped at any intermediate point — the same as when operated by hand — or the operation can be set in motion in the opposite direction at the discretion of the cam¬ era operator by means of the control switch, (6) in Fig. 2. In other words, the device operates forward and reverse to effect zoom-ins and zoom-outs.
Power for driving the zoom control motor is a 24-volt battery mounted on the handle of the tripod head, (5) in Fig. 2, with the voltage reduced by means of a small rheostat. In practice, it has been
Continued on Page 177
= I AMERICAN CINEMATOGRAPHER MANUAL
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FIG. 3 — Cover panel of zoom control is removed to show compo¬ nents. 1, 2, and 4 correspond with same numbers in Fig. 1; 7 is 4-prong electrical connection for switch and power source.
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FIG. 4 — Author's Bolex H16 camera with motorized zoom lens mounted on front of automobile for making low-angle moving-camera zoom shots. Zoom lens and camera motor are remote-controlled from driver's seat.
. if you shoot motion pictures
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AMERICAN CINEMATOGRAPHER, MARCH, 1963
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