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23/11/1948 Frank Back patents zoom lens

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The Hidden History of the Zoom Lens

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What is focal length? Camera lens focal lengths, in 5 minutes

3:01

The Hidden History of the Zoom Lens

4:23

What is focal length? Camera lens focal lengths, in 5 minutes

Austrian-born American engineer Frank Back patented “varifocal lens for cameras.” He worked for the military and wanted to make better cameras for combat camera-men. He wanted to help them take long-distance shots without requiring the camera be moved toward or away. Back called his device Zoomar lens.
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