Now that you have thought about how your camera sees in comparison to what your eyes see it's time to take creative control. There are just three things that control camera exposure; aperture, shutter speed and your ISO setting of your sensor. Change one of the three and the exposure changes, but you can change one and compensate by changing another setting and keep the same exposure when desired. For example you have ISO 400, f/stop 8 and shutter speed of 250 or 1/250, remember to think of f/stop and shutter speed as fractions and it will be easier to understand. Change the shutter speed to 1/125 and you have slowed down the shutter speed by 1 stop which will allow more light on the sensor. This effectively changed your exposure from your original settings. To keep the exposure the same as the original you can do two things, either change the ISO to 200 (1 stop) or change the aperture to f/11 (1 stop).
ISO 400 f/8 1/250
ISO 400 f/11 (smaller aperture lets in less light) 1/125 (slower shutter speed allows more light in to the sensor) makes the exposure the same as the original.
ISO 200 (decreased sensitivity to light by 1 stop) f/8 1/125 (allowed more light to hit sensor by 1 stop) again this is the same exposure as the original.
More later on how to use these changes to take creative control.
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