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.
松开赤经兼小时刻度环的定位螺丝后把赤经兼小时刻度环“0小时”位置对准赤经指示箭头。
Set "0 hour" on the R. A. and hour graduation ring to the R. A. indicator after loosening the graduation-ring setscrew.
设计图像颜色产生模块，对颜色值进行编码，对坐标线和数字刻度进行定位，减化了算法复杂度。
The design of color generating module, which codes color and marks the location of the coordinate line and digital scale, reduces the complexity of algorithm.
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