伸缩管 extension tube
drawtube
- 把副镜中央置于调焦伸缩管的中轴。
Step 1: Center the secondary mirror on the axis of the focuser drawtube. - 安装时使伸缩管伸出伸缩量的1/2,以保证热胀和冷缩的位移。
Extend the pipe out from the support of 1/2 expansion amount to ensure the moving of expanding and shrinking. - 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。
Finally, inside this reflection of the secondary, you can see the focuser drawtube and your eye.
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