Getting proper exposure is always a balance and trade off. Each element can be used to increase or decrease the amount of light striking the sensor. When such adjustments are made, a counter adjustmentElement moreLight LessLight EffectSpeed SlowSpeed FastSpeed SlowApertured needs to be made to one or both of the other elements in order to produce the proper exposure.
Each element will have a trade off that can also be creative.
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Element
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More Light
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Less Light
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Effect
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Shutter Speed
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Slow Shutter Speed
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Fast Shutter Speed
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Slow shutter speed causes motion blur, Fast shutter speed freezes action
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Apature
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Wider open
(small F/stop) |
Smaller opening
(larger F/stop) |
A wide aperture createsISO HighISO The a shallow depth of field (less in focus) where a small aperture creates a larger depth of field (more in focus)
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ISO
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High ISO
(800 or 1600 or higher) |
100 or 200 ISO
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The higher the ISO the more sensitive to light the sensor becomes allowing for faster shutter speeds, smaller aperture settings or both and is especially good for low light situations. The drawback is the higher the ISO is the more digital noise you get reducing the quality a bit.
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