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19-Jun-2016 12:49

no remarks of anything that resembles camera obscura can be found.Claims could be based on later versions, since Ignazio Danti added a description of camera obscura in his 1573 annotated translation.al-Haytam's writings on optics became very influential in Europe through Latin translations since circa 1200.Among the people who he inspired were Witelo, John Peckham, Roger Bacon, Leonardo Da Vinci, René Descartes and Johannes Kepler.

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“Why is it that an eclipse of the sun, if one looks at it through a sieve or through leaves, such as a plane-tree or other broadleaved tree, or if one joins the fingers of one hand over the fingers of the other, the rays are crescent-shaped where they reach the earth?

Using mirrors, as in an 18th-century overhead version, it is possible to project a right-side-up image.

Another more portable type is a box with an angled mirror projecting onto tracing paper placed on the glass top, the image being upright (but still reversed) as viewed from the back.

In his 1088 book Dream Pool Essays the Song Dynasty Chinese scientist Shen Kuo (1031–1095) compared the focal point of a concave burning-mirror and the "collecting" hole of camera obscura phenomena to an oar in a rowlock to explain how the images were inverted: "When a bird flies in the air, its shadow moves along the ground in the same direction.

But if its image is collected (shu)(like a belt being tightened) through a small hole in a window, then the shadow moves in the direction opposite of that of the bird.[...] This is the same principle as the burning-mirror.

The image of the sun shows this peculiarity only when the hole is very small.