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What a telescope's focal length means and why it matters - BBC Sky at Night Magazine
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Telescope Focal Length Explained: Why Does It Matter? | StarLust
Astro Tutorial #1.5: Focal Length and Aperture - YouTube
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Aperture, focal length and focal ratio - Optics Trade Blog
ESSLNB Telescope 28X-350X Telescopes for Adults Kids and Astronomy Beginners 700mm Focal Length Refractor Telescope
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APM Telescopes. Celestron 200 mm Newtonian with focal ratio 1:5
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