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History of the camera

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First published picture of camera obscura in Gemma Frisius' 1545 book De Radio Astronomica et Geometrica
Leonardo da Vinci · Public domain

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Camera obscura (pre-17th century)

The camera obscura (from the Latin for 'dark room') is a natural optical phenomenon and precursor of the photographic camera. It projects an inverted image (flipped left to right and upside down) of a scene from the other side of a screen or wall through a small aperture onto a surface opposite the opening. The earliest documented explanation of this principle comes from Chinese philosopher Mozi (c. 470 – c. 391 BC), who correctly argued that the inversion of the camera obscura image is a result of light traveling in straight lines from its source.

From around 1550, lenses were used in the openings of walls or closed window shutters in dark rooms to project images, aiding in drawing. By the late 17th century, portable camera obscura devices in tents and boxes had come into use as drawing tools.

The images produced by these early cameras could only be preserved by manually tracing them, as no photographic processes had been invented yet. The first cameras were large enough to accommodate one or more people, and over time they evolved into increasingly compact models. By the time of Niépce, portable box camera obscurae suitable for photography were widely available. Johann Zahn envisioned the first camera small and portable enough for practical photography in 1685, but it took nearly 150 years for such an application to become possible.

Ibn al-Haytham (c. 965 – 1040), an Arab physicist also known as Alhazen, made significant contributions to the understanding of the camera obscura, conducting experiments with light in a darkened room with a small opening. He is often credited with the invention of the pinhole camera. He also provided the first correct analysis of the camera obscura, offering the first geometrical and quantitative descriptions of the phenomenon, and was the first to utilize a screen in a dark room for image projection from a hole in the surface. He was the first to understand the relationship between the focal point and the pinhole, and was the pioneer of early afterimage experiments.

The work of Ibn al-Haytham on optics, circulated through Latin translations, played a significant role in inspiring notable individuals such as Witelo, John Peckham, Roger Bacon, Leonardo da Vinci, René Descartes, and Johannes Kepler. The Camera Obscura was used as a drawing aid since at least around 1550. By the late 17th century, portable versions of the device housed in tents and boxes became commonly used for drawing purposes.

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