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What are DSLR cameras?                                                                                                               

DSLR stands for Digital Single Lens Reflex camera. In the old days of film we simply had an SLR. The term" single lens reflex" actually refers to the our ability to look through the viewfinder and see, through a series of mirrors,the scene in front of us through the actual lens, as opposed to the traditional compact cameras that simply give you a parallel view. Instead of film, a dslr uses an digital electronic sensor.
How the camera sees images

The camera works in a similar principle to our eyes. So let's compare them.

How we see images

Light passes through the lens after first passing through the pupil, and then converges at the focal point: the retina, which then sends the image to our brain via the optical nerve. As you can see the image is upside down, because the light rays are inverted, but our brain flips the image back upright.

Our eye is permanently exposed to light, hence we see moving images.



How the camera sees images

Just like our eye, the camera adopts a similar principle. Only instead of a pupil, it has an aperture. Light passes through the aperture, then the lens (or a series of lenses in most modern lenses), converges at the focal point: the sensor (digital) or film. The image is then sent to the camera’s brain (microprocessor). Just as with our eye, the image on the sensor or film is flipped back upright by the camera’s software.

The camera is only exposed to light for a period of time, known as exposure time. Hence it captures a still image.

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