結果 : how does focal ratio affect telescopes
6:28

Telescope Focal Ratio Explained

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Focal Length vs. Focal Ratio: What They Do Conceptually! #astronomy #science #telescope

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13:34

How Does Focal Length Change What Size Pixels a Camera Sensor Needs?

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Telescopes: Focal ratio, plane and telescope types

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INCREDIBLE Difference - Barlow vs. Focal Reducer

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What's Up? Webcast: Understanding F Ratio

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Telescope Focal Length Explained

StarLust
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How to Choose the Right Focal Length Telescope for Astrophotography // Guide for Beginners

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