Understanding Photography Exposure
In some lighting situations, the camera can’t select settings that produce an optimal exposure in the P, Tv, or Av mode, however. Because the meter indicates the current Exposure Value in those modes, the camera alerts you to exposure issues as follows:
To get the good exposure, you need take a lot practice to get familiar with the relationship among aperture, shutter and ISO settings in MANUAL mode, additionally and optionally using exposure compensation when using APERTURE and SHUTTER prority modes and gettting that white balance right.
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