Those of us who appreciate still use 19th century lenses, even in the 21st century, often marvel at the quality achieved by the old craftsmen. Considering the technological knowledge and expertise of that period, such creations as the Petzval, the Globe lens, etc. seem hardly possible, seeming far more advanced than the times they came from. And I'm pretty sure I've figured out how the ancient lens-makers were able to create those sophisticated marvels of optical engineering.
Aliens.
I'm thinking of writing an episode for The History Channel about it...
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