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A pinhole camera is a simple camera without a lens but with a tiny aperture (the so-called pinhole)—effectively a light-proof box with a small hole in one side. Light from a scene passes through the aperture and projects an inverted image on the opposite side of the box, which is known as the camera obscura effect.
The image plane is parallel to axes X1 and X2 and is located at distance from the origin O in the negative direction of the X3 axis, where f is the focal length of the pinhole camera. A practical implementation of a pinhole camera implies that the image plane is located such that it intersects the X3 axis at coordinate -f where f > 0.
In December 2014, Peter Lik reportedly sold a photograph titled Phantom to an anonymous bidder for $6.5 million, making it potentially the third highest price paid for a photograph. [33] [34] [35] Lik's claim has been greeted with much scepticism.
He is often credited with the invention of the pinhole camera. [3] [4] He also provided the first correct analysis of the camera obscura, [5] offering the first geometrical and quantitative descriptions of the phenomenon, [6] and was the first to utilize a screen in a dark room for image projection from a hole in the surface. [7]
The Great Picture in its pinhole camera hangar. Orthorectified negative (top) and positive (bottom) representations of the photograph, partially obscured by two people. As of 2011, The Great Picture (111 feet (34 m) wide and 32 feet (9.8 m) high) holds the Guinness World Record for the largest print photograph, and the camera with which it was made holds a record for being the world's largest. [1]
The result is that the effective f-number of a zone plate is lower than for the corresponding pinhole and the exposure time can be decreased. Common f-numbers for a pinhole camera range from f /150 to f /200 or higher, whereas zone plates are frequently f /40 and lower.