Large Pinhole Camera Obscura

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jonathanpolkest on March 21, 2011

Camera obscura in Encyclopédie, ou dictionnaire raisonné des sciences, des arts et des métiers aux j.Polkest

The first mention of the principles behind the pinhole camera, a precursor to the camera obscura, belongs to Mo-Ti (470 BCE to 390 BCE), a Chinese philosopher and the founder of Mohism. Mo-Ti referred to this camera as a "collecting plate" or "locked treasure room".[2] The Mohist tradition is unusual in Chinese thought because it is concerned with developing principles of logic. The Greek philosopher Aristotle (384 to 322 BCE) understood the optical principle of the pinhole camera. He viewed the crescent shape of a partially eclipsed sun projected on the ground through the holes in a sieve, and the gaps between leaves of a plane tree.

The camera obscura was known to earlier scholars since the time of Mozi and Aristotle.[3] Euclid's Optics (ca 300 BC), presupposed the camera obscura as a demonstration that light travels in straight lines.

In the 4th century BC, Aristotle noted that "sunlight travelling through small openings between the leaves of a tree, the holes of a sieve, the openings wickerwork, and even interlaced fingers will create circular patches of light on the ground." In the 4th century AD, Theon of Alexandria observed how "candlelight passing through a pinhole will create an illuminated spot on a screen that is directly in line with the aperture and the center of the candle." In the 9th century, Al-Kindi (Alkindus) demonstrated that "light from the right side of the flame will pass through the aperture and end up on the left side of the screen, while light from the left side of the flame will pass through the aperture and end up on the right side of the screen."

In the 6th century, Byzantine mathematician and architect Anthemius of Tralles (most famous for designing the Hagia Sophia), used a type of camera obscura in his experiments.

While these earlier scholars described the effects of a single light passing through a pinhole, none of them suggested that what is being projected onto the screen is an image of everything on the other side of the aperture. Abu Ali Al-Hasan Ibn al-Haytham (965–1039 AD), known in the West as Alhacen or Alhazen, in his Book of Optics (1021), was the first to demonstrate this with his lamp experiment where several different light sources are arranged across a large area, and he was thus the first scientist to successfully project an entire image from outdoors onto a screen indoors with the camera obscura. Alhazen provided the first clear description and correct analysis of the device and for first describing how an image is formed in the eye using the camera obscura as an analogy. The photograph shows the Felixavigraph

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Photo details

  • Uploaded on March 21, 2011
  • © All Rights Reserved
    by jonathanpolkest
    • Camera: Panasonic DMC-FZ7
    • Taken on 2011/03/19 16:52:11
    • Exposure: 0.033s (1/30)
    • Focal Length: 6.00mm
    • F/Stop: f/2.800
    • ISO Speed: ISO80
    • Exposure Bias: 0.00 EV
    • No flash

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