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Focal Length Explained 1 - Don't just zoom - MOVE! - YouTube
Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
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Thiery Legault - How to adjust the focal length ?
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Focal length - Wikipedia
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How does curvature affect focal length? - Quora
Lenses. Field of view and focal length
