what telescope should i look for?
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How to Choose Eyepieces for Your Astronomy Telescope
What a telescope's focal length means and why it matters | BBC Sky at Night Magazine
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Telescope Focal Length: Everything You Need To Know
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focal ratio - Society for Popular Astronomy
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Telescope Focal Length: Everything You Need To Know
Two-mirror telescope aberrations
Children's beginner's 70mm aperture 400mm focal length astronomical refracting telescope-with carrying bag, adjustable tripod travel telescope - KENTFAITH
Confused with scope focal length - what am I missing? - Beginners Forum (No Astrophotography) - Cloudy Nights
Telescope Focal Length Explained: Why Does It Matter? | StarLust
What a telescope's focal length means and why it matters | BBC Sky at Night Magazine
Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
