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1·And you have already studied something about Barlow Lens and Equator Mounts…

而且你已经了解了一些巴洛镜和赤道仪的知识…

2·Removing the extension tube shortens the spacing to allow any binocular viewer to reach focus without a Barlow lens.

除去延长管缩短 间隔让任何的用两眼的观众到达没有一个巴罗镜的焦点。