Exposure Compensation is a great tool to use when you need it.
Unfortunately, on some cameras it's possible to inadvertently turn on
Exposure Compensation. You might find that you're shooting in an automatic
exposure mode such as Aperture Priority, Shutter Priority, or Program Mode
but still, all of your pictures are too light or too dark.
If that happens, chances are you accidentally have Exposure Compensation
dialed in. In other words you're asking the camera to intentionally
over expose or under expose. Again, some cameras put the button for this in an
unfortunate place and it's easy to turn it on without knowing it. So make sure you
understand about Exposure Compensation and know how to turn it on and off on
your camera.
Thanks.