The mechanical motions decrease the speed of zooming, increase space and weight for zoom system, may induce unwanted jitter, and require large power consumption.
该机械运动降低变焦速度，并增 加使用于变焦系统的空间与重量，可能引起不需要的抖动且需要较大的功率消耗。
Kodak's system is reasonably effective , producing sharp images most of the time at full zoom anda shutter speed of 1/25th of a second, although slower speeds defeated it.
柯达的系统令人印象深刻，在1/25秒的快门速度时，大多数时候在各个焦段都能拍出锐利的照片，尽管快门再慢就不行了。
Introduced a method of controlling and calibrating focal length about zoom lens used in precision measurement in High-Speed TV measurement Instrument.
介绍了变焦距镜头在高速电视测量仪中用于精密测量的控制和标校方法。
Introduced a method of controlling and calibrating focal length about zoom lens used in precision measurement in High-Speed TV measurement Instrument.
介绍了变焦距镜头在高速电视测量仪中用于精密测量的控制和标校方法。
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