Newton Focus Telescope - 搜索图片

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Seeking advice on a vintage long focus Newtonian - Clas…
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YouTube > Masa Schumit
Installation of Focus Motor on SkyWatcher Newton Telescope: Normal and Fine Focus Mode.
YouTube · Masa Schumit · 3132 次播放 · 2020年10月8日
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Telescopes - All About Astronomy
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