Originally posted by slickfast
Ie. If you're in Av mode, the camera will meter the light for you and use that information to set the shutter speed. You can have a little control over this by using the exposure comp feature to fine tune things.
If you're in manual mode, it will meter the light, but not use that information to alter the settings of the camera. It *will* crosscheck what it knows with your camera settings and determine whether or not you're doing a good job. Take a look at the exposure scale (-2, -1, 0, 1, 2,)...there will be an arrow there. If the arrow is on 0, it thinks your settings are optimal for the light it's metering. If it's reading "2", it thinks you're overexposed. You may choose to give yourself a quicker shutter speed (the arrow will move down closer to 0). You may also choose to ignore its recommendations.
Play around with the different metering modes. Spot metering is very helpful for certain things, but other times you do want to use evaluative metering, or the center-weighted average mode, ect. They all have their place.

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