OpenStudy (anonymous):

What is a pinhole camera? How do we know that these devices existed before the nineteenth century?

4 years ago
OpenStudy (dean.shyy):

Pinhole cameras are objects that have a pinhole camera embeded into them. The size of the pinhole is just as what it says. However, the standard term suggests that a pinhole camera lacks a lens, and a single small aperture. They have existed long before the 19th century, as it was used mostly for undercover and/or general surveillance.

4 years ago
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