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Many camerae obscurae use a lens rather than a pinhole (as in a pinhole camera) because it allows a larger aperture, giving a usable brightness while maintaining focus.

As the pinhole is made smaller, the image gets sharper, but the projected image becomes dimmer.

The earliest known written record of the camera obscura is to be found in Chinese writings called Mozi and dated to the 4th century BCE, traditionally ascribed to and named for Mozi (circa 470 BCE-circa 391 BCE), a Han Chinese philosopher and the founder of Mohist School of Logic.The human eye as well as those of other animals including birds, fish reptiles much like a camera obscura with an opening (pupil), a biconvex lens and a surface where the image is formed (retina).A camera obscura device consists of a box, tent or room with a small hole in one side.Light from an external scene passes through the hole and strikes a surface inside, where the scene is reproduced, inverted (thus upside-down) and reversed (left to right), but with color and perspective preserved.The image can be projected onto paper, and can then be traced to produce a highly accurate representation.In order to produce a reasonably clear projected image, the aperture has to be about 1/100th the distance to the screen, or less.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.There are theories that occurrences of camera obscura effects (through tiny holes in tents or in screens of animal hide) inspired paleolithic cave paintings.The term "camera obscura" also refers to constructions or devices that make use of the principle within a box, tent or room.Camerae obscurae with a lens in the opening have been used since the second half of the 16th century and became popular as an aid for drawing and painting.

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