drawtube 中文意思是什麼
drawtube
解釋
活鏡筒-
Like the primary mirror, the eyepiece has an optical axis, and this axis should be aimed at the center of the main mirror for best performance ? though in practice it is the center axis of the focuser drawtube that you aim at the primary mirror
目鏡和主鏡一樣也有光軸，光軸應該對準主鏡的中心? ?盡管實際上，目鏡的光軸對準的是調焦筒（相當于調焦座）的中心。 -
Finally, inside this reflection of the secondary, you can see the focuser drawtube and your eye
最後，在副鏡的反射像中，你能看到調焦座的伸縮管和你的眼睛的像。
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