What does Exposure Compensation actually do, inside the camera?

Started Jul 6, 2013 | Discussions thread
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will222
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What does Exposure Compensation actually do, inside the camera?
Jul 6, 2013

When you change the exposure compensation, what is being varied (presumably shutter speed, aperture, and ISO are the only "handles" for adjustment?), and how does the camera choose which one is varied for a given shot?

Is this implemented in different ways in different cameras, so there's no exact answer?

If you are in Aperture priority or Shutter priority mode, and you change the exposure compensation, are you in effect switching to Program mode (i.e. some algorithm decides the shutter speed or aperture or ISO change to make, starting from whatever baseline you had manually set before you adjusted the Exposure Compensation)?

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