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。

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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。

youdao