Step 1: Center the secondary mirror on the axis of the focuser drawtube.
把央置于焦伸缩轴。
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Stray light can bounce off of the inside of a telescope and end up in the eyepiece or focuser, which can affect the contrast and ruin the view.
杂光会在镜内不断反射,并最终呈现在镜或聚焦器上,这种反射不仅会影响对,会破坏观测结果。
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