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

央置于焦伸缩管

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dress up, dressage, dressed, Dressed to Kill, dressed up, dresser, dressers, dresses, dressguard, dressily,

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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,并最器上,这种反射不仅会影响对比度,也会破坏观测结果。

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driblet, dribs, DRIC, DRID, dried, dried apricot, dried fruit, dried milk, dried-up, driegh,

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3G, 401(K), a,
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