The exposure is defined as how much light hits the camera sensor. It depends on the camera settings, especially aperture and shutter speed. Exposure value (known as EV) is a figure that the exposure setting the camera. We will explain what the number means and how it is used for exposure correction.

The exposure depends on two things: how much light is through the lens of the camera's sensor and for how long the sensor is exposed. The former is a function of the aperture value, while the latter is a function of time. Exposure value is a number that the potential amount of light that could be based on the sensor. It is important to understand that the exposure value is a measure of how the sensor is exposed to light and not a measure of how much light actually hits the sensor. The exposure value is illuminated regardless of how the scene is. For example, a pair of aperture and shutter speed, exposure, the same value both when the camera is used during a very bright day, or during a dark night.

Each claim is worth paying for all sorts of shutter speed and aperture settings, in the same exposure. Although the exposure value is the same for different combinations of aperture and shutter speed values the resulting photograph can be very different (the aperture controls the depth of space, while shutter speed controls how much movement captured)

EV 0.0 is defined as the exposure when setting the aperture to f-number 1.0 and the shutter speed of 1 second. All other exposure values are relative to that number. Exposure levels are on a two logarithmic scale. This means that every single step of the EV - plus or minus 1 - provides the exposure (actual light hits the sensor) will be halved or doubled.

It is not likely that you find setting absolute levels of exposure. Most cameras do not support entering exposure levels at all. But they will use exposure levels in setting the exposure correction. Exposure Compensation is a way to start the camera exposure, the lower or higher than what was recognized automatically. The camera automatic exposure setting is not perfect and in some scenes results in over or under exposed photos. In such cases, exposure compensation can solve the problem Exposure Compensation is also useful if you like photos, a little over or under exposed.

In determining exposure correction you an exposure value in the current exposure setting. In general, exposure compensation values are not more than + / -5 EV. For example, a compensation-2ev is a photo darker (or less exposed), while a compensation of +2 EV will be brighter (or more exposed). A good example of using exposure correction is on a bright day. Compensate for the reduction of exposure with a value of 0.5EV-or-1EV to richer colors and more information.

Exposure levels can also be used in conjunction with auto bracketing. When using auto exposure bracketing each time you get a photo of the camera takes a number of additional photos for you, each with a slightly different exposure. You can use the EV step between the individual photographs.

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Jacob Georgeson writes the digital world and business. Jacob Georgeson is photography, Internet and financial writer. You can read more at Exposure value This article can be reprinted only if the resource box including the backlink is included.