There may have been many instance wherein you may obtain images that are a little blurred or lack proper lighting. This is often due to insufficient light. For a proper photo the correct amount of light has to reach the camera lens. This can be varied by varying the aperture number or the shutter speed of the camera. However while using full manual mode it may be confusing to set the correct shutter speed as per the aperture number. Thus you can now vary the exposure compensation factor to get a realistic image.
The exposure compensation is is a method of adjusting the exposure that is indicated by the exposure meter to result in a realistic image. In fact many cameras include exposure compensation as a functionality. It is a function that allows the user to adjust the exposure. Compensation can either be positive or negative. It is stated in terms of exposure value ‘EV’; one EV is considered equal to one exposure step. In case you are in the aperture mode then by using the exposure compensation you are in fact modifying the exposure time while in the shutter speed mode you are changing the f-number. In a camera the EV denotes all the values of aperture and shutter that would deliver the same exposure. Though all these camera settings provide the same exposure value; it is not mandate that they will reproduce the same image. The shutter speed determines the blur in the images while the comparative aperture determines the depth of field.
Most of the digital cameras do not provide an option to modify the exposure value except a some medium format cameras such as the Rollei models and Hasselblad models. This set EV could be locked thus providing you with a an image with the correct lighting effects. By doing this; when the shutter or aperture is adjusted the other factor gets adjusted correspondingly. However these days many cameras comes with an exposure compensation factor; this is the difference between the set exposure and the indicated exposure value. For any particular ISO setting there exists a direct relationship between the exposure value and brightness level. Generally the range of exposure adjustment ranges between +0 to -2 EV in 1/3 steps. This indicates that you can tell the camera how much light should be let to reach the lens.
In order to save you the pain of manually adjusting the exposure; these days cameras comes with the Automatic Exposure Braketing (AEB) method wherein the camera takes 3 shots; one with the auto set exposure mode, next with positive exposure mode and third with negative exposure mode. You can check later to save which you want and discard the rest. This is one functionality you can look out for while buying a digital camera as the proper exposure details bring out the essence of your photos.
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