当镜头涉及距离或光线状况需渐进或突然改变时，在摄影机镜头上测量并记出焦距及光圈的位置。
利用里程仪可以抑制惯导的误差积累，但里程仪刻度系数误差对组合系统的定位精度影响很大，必须对其进行校正。
The error accumulation of inertial navigation system can be restrained via OD, however, OD scale factor error has remarkable effect on the positioning precision.
然后把电容电极接合到一个耦合于精密定位刻度系统的纸芯坯上。
Next, the capacitive electrodes are bonded to a paper core stock which is coupled to a precisely positioned indexing system.
结构Structure：由底座、支承块、导轨、滑块、手柄、可调定位块、刻度尺等组成。
From the base, bearing blocks, rails, sliders, handles, adjustable positioning block, scales and other components.
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