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Caleb
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I notice that using AV or TV mode that the meter sets itself to an "average" grey automatically smack in the middle. But using Manual mode, it fluctuates alot no matter what metering i.e. evaluative, spot etc, setting i use.

With Av or Tv modes, the camera adjusts shutter speed or aperture, respectively, to achieve a good exposure based on the metering mode you've chosen, so the meter normally shows a reading right in the middle of its range. With M mode, you're in control of all the parameters (shutter speed, aperture, and sensitivity), the camera tells you what the meter says without trying to change any settings to compensate. You're free to adjust any of those parameters to get the meter to read +/-0EV if you want to, but you obviously don't have to do that.

Caleb
  • 31.7k
  • 6
  • 67
  • 120