Exposure: The Basic Idea for Digital Photography
EXPOSURE means the amount of light entering into the SENSOR of a camera.The more light entering to sensor is the result of more brighter in picture , similarly less light entering to sensor is the result of more darker in Picture.
How much light is let into your sensor is only the function of shutter speed and aperture.The shutter speed is commonly expressed as in fraction of second like 1/250, 1/30, 1/1600 etc.Exactly Shutter speed known as the amount of time the shutter opens to let light in.
Since the number is expressed as fraction, the smaller the denominator , the longer the exposure. For example, 1/300th of a second is a much shorter amount of time than 1/25th of a second. Consequently, a shutter speed of 1/300th of a second will let in much less light into sensor and produce a much darker image than a shutter speed of 1/25th of a second. Also note that the longer the exposure, the blurrier any action in the photo will become.
And the aperture is commonly expressed as in f-stop like f-stop/1, f-stop/2, f-stop/3.5, f-stop/4.6, f-stop/5 etc.Behind the lens is an adjustable opening called the aperture, through which the light passes on its way to the film. The F stop is a measure of the size of this opening.The smaller the number associated with the denominator of the focal length, the greater the size of the hole, which means more light entering the camera and consequently a brighter picture.
How much light is let into your sensor is only the function of shutter speed and aperture.The shutter speed is commonly expressed as in fraction of second like 1/250, 1/30, 1/1600 etc.Exactly Shutter speed known as the amount of time the shutter opens to let light in.
Since the number is expressed as fraction, the smaller the denominator , the longer the exposure. For example, 1/300th of a second is a much shorter amount of time than 1/25th of a second. Consequently, a shutter speed of 1/300th of a second will let in much less light into sensor and produce a much darker image than a shutter speed of 1/25th of a second. Also note that the longer the exposure, the blurrier any action in the photo will become.
And the aperture is commonly expressed as in f-stop like f-stop/1, f-stop/2, f-stop/3.5, f-stop/4.6, f-stop/5 etc.Behind the lens is an adjustable opening called the aperture, through which the light passes on its way to the film. The F stop is a measure of the size of this opening.The smaller the number associated with the denominator of the focal length, the greater the size of the hole, which means more light entering the camera and consequently a brighter picture.
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| EXPOSURE TRIANGLE |
Finally don't forget about your ISO setting in camera.ISO setting is also affect the brightness of the picture in accordance with the quality of picture as ISO increases so does color noise, which really brings down the quality of the photo.
The theory or the concept about BASIC EXPOSURE in digital photography is getting perfect exposure or perfect light while shooting photographs.The perfect Exposure is nothing more than the combination of perfect shutter speed , perfect aperture , predetermined ‘ISO’ working together.My point is clear that "to get perfectly exposed picture" a photographer must have to balance and coordinate three things: film speed(ISO), shutter speed and f stop(aperture).
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| An example of perfectly exposed image |
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