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Photography

A view inside a digital single-lens reflex camera (DSLR). It combines the workings of a single-lens reflex camera (see below),...Read More >>A view inside a digital single-lens reflex camera (DSLR). It combines the workings of a single-lens reflex camera (see below), with a digital "back": a charge-coupled device (CCD) to capture the image. It is a superior camera to a compact digital camera.A camera is a device that records an image of a scene, either electronically as a digital photograph or on photographic film. The main features of a camera are a lens and a shutter. Light from a scene is let into the camera when the shutter opens. The lens focuses the light on to the back of the camera. In this way it makes a small copy of the scene called an image. The image is captured on a charge-coupled device (CCD) or on a strip of photographic film. Today most cameras are digital, and digital cameras are often incorporated into devices such as smartphones.



How a camera works

Digital camera Diagram of two typical models of digital camera: compact (top) and single-lens reflex (above). Key: 1 Lenses 2 Charge-coupled...Read More >>Diagram of two typical models of digital camera: compact (top) and single-lens reflex (above). Key: 1 Lenses 2 Charge-coupled device (CCD) 3 Liquid crystal display (LCD) 4 Viewfinder 5 Mirror 6 Shutter 7 Pentaprism
A camera's main features are a light-proof body, a lens and a shutter. The lens gathers rays of light from the scene that the camera is pointed at and bends them so that all the rays from one point on the scene are focused to meet at the same place at the back of the camera. In this way it makes a small copy of the scene called an image.
The shutter opens to allow light from the lens to reach the light sensors or film. The shutter speed (how long the shutter opens for) and size of the aperture (an opening behind the lens) can be adjusted to regulate the light sensor or film's exposure to light.

A Kodak employee, US electrical engineer Stephen Sasson, invented the world's first digital camera in 1975, using a charge-coupled device (CCD). It took 23 seconds to capture its first image, which had a resolution of 10,000 pixels.

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