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What a telescope's focal length means and why it matters - BBC Sky at Night Magazine
Lecture 7: Optics and Telescopes
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Telescope Focal Length Explained: Why Does It Matter? | StarLust
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APM Telescopes. Celestron 200 mm Newtonian with focal ratio 1:5
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Vintage Precision Made Kmart Focal Telescope 20X60X60MM In Original Box | eBay