More Fast Focal Ratio Mythconceptions
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Understanding Focal Length: Trading Speed for Detail
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Astro Tutorial #1.6: THE F-RATIO "fast" vs "slow" scopes
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Mike prend sa retraite de l'astronomie - Soixante symboles
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How to Tell If Your Image Needs More Integration Time
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Focal Length vs. Focal Ratio: What They Do Conceptually! #astronomy #science #telescope
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How the SCT Creates Focal Length Out of Thin Air
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How to Do Astrophotography During Any Moon Phase
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