26 Facts About Camera obscura


Camera obscura can refer to analogous constructions such as a box or tent in which an exterior image is projected inside.

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The concept was developed further into the photographic camera in the first half of the 19th century, when camera obscura boxes were used to expose light-sensitive materials to the projected image.

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Camera obscura was used to study eclipses without the risk of damaging the eyes by looking directly into the sun.

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Box-type camera obscura often has an angled mirror projecting an upright image onto tracing paper placed on its glass top.

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One of the earliest known written records of a pinhole camera for camera obscura effect is found in the Chinese text called Mozi, dated to the 4th century BC, traditionally ascribed to and named for Mozi, a Chinese philosopher and the founder of Mohist School of Logic.

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Camera obscura is touched upon as a subject in Aristotle's work Problems – Book XV, asking:.

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Camera obscura must have understood the relationship between the focal point and the pinhole.

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Camera obscura described a "dark chamber", and experimented with light passing through small pinholes, using three adjacent candles and seeing the effects on the wall after placing a cutout between the candles and the wall.

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Camera obscura is credited with a manuscript that advised to study solar eclipses safely by observing the rays passing through some round hole and studying the spot of light they form on a surface.

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Picture of a three-tiered camera obscura has been attributed to Bacon, but the source for this attribution is not given.

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Camera obscura determined the eccentricity of the sun based on his observations of the summer and winter solstices in 1334.

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Camera obscura systematically experimented with various shapes and sizes of apertures and with multiple apertures .

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Camera obscura compared the working of the eye to that of the camera obscura and seemed especially interested in its capability of demonstrating basic principles of optics: the inversion of images through the pinhole or pupil, the non-interference of images and the fact that images are "all in all and all in every part".

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Camera obscura suggested to use it to view "what takes place in the street when the sun shines" and advised to use a very white sheet of paper as a projection screen so the colours wouldn't be dull.

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Camera obscura suggested to use a convex lens to project the image onto paper and to use this as a drawing aid.

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Camera obscura described use of the camera obscura to project hunting scenes, banquets, battles, plays, or anything desired on white sheets.

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Kepler discovered the working of the camera obscura by recreating its principle with a book replacing a shining body and sending threads from its edges through a many-cornered aperture in a table onto the floor where the threads recreated the shape of the book.

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Camera obscura realized that images are "painted" inverted and reversed on the retina of the eye and figured that this is somehow corrected by the brain.

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In 1607, Kepler studied the sun in his camera obscura and noticed a sunspot, but he thought it was Mercury transiting the sun.

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Dutch inventor Cornelis Drebbel is thought to have constructed a box-type camera obscura which corrected the inversion of the projected image.

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Camera obscura explained how the camera obscura could be used by painters to achieve perfect perspective in their work.

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Camera obscura complained how charlatans abused the camera obscura to fool witless spectators and make them believe that the projections were magic or occult science.

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Camera obscura then constructed his own sliding box camera obscura, which could focus by sliding a wooden box part fitted inside another wooden box part.

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Camera obscura wrote about this in his 1657 Magia universalis naturæ et artis .

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Homemade camera obscura are popular primary- and secondary-school science or art projects.

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Camera obscura created by Mark Ellis in the style of an Adirondack mountain cabin, Lake Flower, Saranac Lake, New York.

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