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Step 1: Center the secondary mirror on the axis of the focuser drawtube.

把副镜中管的中轴。

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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影响对比度,坏观测结果。

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endodontology, endoduplication, endodyocyte, endodyogeny, endoenzyme, endo-erepsin, endoergic, endoergicity, endoerythrocytic, endo-exocrine,

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3G, 401(K), a,
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