Specifications for motion - picture cameras - zero point for focusing scales - 16mm and 8mm 电影摄像机的规范.调焦刻度的零点. 16mm和8mm
If not , either the secondary holder or the focuser ( or both ) needs attention 如果不是这样，要么副镜支架或调焦座（或两者）需要注意了。
Put it in the focuser and observe the reflection of its shiny 45 - angle face in the primary 把它放到调焦座上，观察它的45度角的反射面。
Ultrasonics - focusing transducers - definitions and measurement methods for the transmitted fields 超声学.调焦传感器.传输区的定义和测量方法
Contact lenses - determination of back vertex power - part 1 : method using focimeter with manual focusing 隐形眼镜.后顶点焦强的测定.第1部分:人工调焦焦距计法
Finally , inside this reflection of the secondary , you can see the focuser drawtube and your eye 最后，在副镜的反射像中，你能看到调焦座的伸缩管和你的眼睛的像。
Experimental results show that the system can realize good focus in a wider range of illuminance 实验结果表明，在较宽范围的光照度条件下，应用该系统均能获得良好的调焦效果。
Step 2 : here you adjust the tilt of the secondary mirror to aim the focuser ' s axis at the center of the primary 现在你已经调整了副镜的倾斜程度，把调焦座的中轴已经对准了主镜。
This rotator device is still used today for all takahashi focuser from the 2 ” to 4 ” focusers and all astrographs 该旋转接口至今仍应用于高桥的2 ”到4 ”的调焦座以及天文摄影中。
An auto convergence system shall be provided to automatically align the projected image on the screen manual convergence shall also be possible 必须提供一个自动调焦系统以排列要放映的图像。同样的，也可以人工调焦。
