| Reflex
mirror and other improvements (contd.) |
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| • | In 1685, Johann
Zahn, a monk from Wurzburg, solved the |
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| final piece in
the optical puzzle. Improving upon Sturm's |
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| design, he
introduced lenses of longer and shorter focal |
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| lengths. Scenes
as wide as a landscape or as close as a |
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| portrait could be viewed
with a simple change of lens. |
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| Page from
“Oculus”, Johann Zahn, |
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| 1685 |
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