An image captured by your camera whether dark or light is determined by exposure. To achieve a certain exposure there are many different combinations on how we can control the light by quantity, time and quality. It is controlled by three parameters; 1. aperture 2. shutter speed 3. ISO.
Exposure is relative to filling a bucket with water from a faucet. If we fully open the faucet, the more amount of water will come out and the faster the bucket will be filled. If we reduce the opening of the faucet, the more time it will take to fill the bucket because the amount of water will be less. In this scenario, we can get the same result which is to properly fill the bucket with water having different combinations by amount and time. The opening of the faucet is our aperture, the water is the light and time is our shutter speed. An underexposed image collects less light while an overexposed image collects more light, we just have to ensure the right combination to get the right exposure.
Each parameter however controls a different perspective of exposure:
1. Aperture - is the opening of the lens which controls the amount of light going to the camera's sensor. It is also one of the factors affecting depth of field.
2. Shutter Speed - controls the time of light going to the camera's sensor by opening and closing the curtains (shutter). It also affects motion blur.
3. ISO - controls the sensitivity of light. It also controls the quality of the image by affecting the noise (grains).
There's a lot more that can be discussed from this topic and you may want to check the other succeeding articles.
Exposure is relative to filling a bucket with water from a faucet. If we fully open the faucet, the more amount of water will come out and the faster the bucket will be filled. If we reduce the opening of the faucet, the more time it will take to fill the bucket because the amount of water will be less. In this scenario, we can get the same result which is to properly fill the bucket with water having different combinations by amount and time. The opening of the faucet is our aperture, the water is the light and time is our shutter speed. An underexposed image collects less light while an overexposed image collects more light, we just have to ensure the right combination to get the right exposure.
Each parameter however controls a different perspective of exposure:
1. Aperture - is the opening of the lens which controls the amount of light going to the camera's sensor. It is also one of the factors affecting depth of field.
2. Shutter Speed - controls the time of light going to the camera's sensor by opening and closing the curtains (shutter). It also affects motion blur.
3. ISO - controls the sensitivity of light. It also controls the quality of the image by affecting the noise (grains).
There's a lot more that can be discussed from this topic and you may want to check the other succeeding articles.
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