望遠鏡の焦点距離の説明
Telescope Focal Length Explained
Focal Length and Magnification Explained - Beginner Part 2
Most Versatile Focal Length for a Telescope?
望遠鏡の焦点比の説明
The Camera Sensor Size/Focal Length Relationship
Astro チュートリアル #1.6: F-RATIO の「高速」スコープと「低速」スコープ
望遠鏡の焦点距離の説明 + ディープ ダーク スカイ ツアー
望遠鏡: 焦点距離 1.5 メートルの望遠鏡 2 台による土星の銃撃戦 - どちらが勝ちますか?
Focal Length vs. Focal Ratio: What They Do Conceptually! #astronomy #science #telescope
Understanding Focal Length: Trading Speed for Detail
How Does Focal Length Change What Size Pixels a Camera Sensor Needs?
Nikon 70-300 mm lens vs 60X telephoto lens moon photography #short #shorts #ytshorts #photography
Astronomy - Ch. 6: Telescopes (11 of 25) The Newtonian Reflecting Telescope
What is the difference between Barlows, Focal Extenders and Focal Reducers?
Watch Moon with New eyepiece.#shorts #astronomy #telescope
Moon w/ 1200mm telescope as a camera lens #astronomy #photography
Refractor vs Reflector telescope explained for beginners
What's inside Telescope Eyepiece
Telescope Properties - Aperture, Focal Length and Magnification Explained