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Stereoscopy

A method of creating the illusion of depth by showing each eye a slightly different photograph of the same scene. The two pictures are taken from points about as far apart as human eyes.

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Panoramic photography

Photography with a very wide field of view, usually much wider than it is tall. A panorama can be made with a special panoramic camera or by joining several photographs together.

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Light painting

A technique in which a moving light source is used during a long exposure to draw shapes or to light parts of a scene step by step.

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Infrared photography

Photography that records infrared light, which is just beyond the red end of what the human eye can see. Special film, a converted digital camera or a filter that blocks visible light is needed.

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Tilt-shift

A lens or camera movement that can tilt the lens (to change the plane of focus) and shift it (to move the image without moving the camera). See also shift lens and Scheimpflug principle.

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Tethering

Connecting a camera to a computer or tablet, by cable or wirelessly, so that each photograph appears on the larger screen right after it is taken.

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Eye AF

An autofocus mode that detects a person's or animal's eye and keeps it in focus automatically.

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Mirror lock-up

A function on SLR cameras that raises the mirror before the shutter opens. This stops the vibration of the moving mirror from blurring the picture.

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Live view

A mode in which the camera shows the image from the sensor in real time on the rear screen or in an electronic viewfinder.

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Large format

Film or cameras that use sheets of film of 4 x 5 inches (about 10 x 12 cm) or larger. Large format photographs are usually made with a view camera on a tripod. See also sheet film.

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Twin-lens reflex

A camera with two lenses of the same focal length, one above the other. The top lens shows the image on a focusing screen through a mirror, and the bottom lens takes the picture. It is often shortened to TLR.

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Shallow depth of field

A photograph in which only a thin part of the scene is sharp, while the foreground and background are blurred. It is made with a wide aperture, a long focal length or a close subject.

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Circle of confusion

The largest blur spot that the human eye still sees as a sharp point at a normal viewing distance. A point of light that is slightly out of focus is recorded as a small disc. If that disc is small enough, it still looks sharp.

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Image stabilization

A technology that reduces blur caused by camera shake. It is often shortened to IS. Other brand names include VR (Nikon) and OIS (optical image stabilization).

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Sensor size

The physical size of a camera sensor. Common sizes include full frame (36 x 24 mm), APS-C, Four Thirds and the much smaller sensors in phones. Medium format sensors are larger than full frame.

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CCD

Short for charge-coupled device, a type of image sensor. The CCD was invented in 1969 at Bell Labs by Willard Boyle and George E. Smith, who received the Nobel Prize in Physics for it in 2009.

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Megapixel

One million pixels. It describes the resolution of a camera sensor or an image. A 24-megapixel sensor records about 24 million pixels, for example 6000 by 4000.

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