On my iPhone the default camera app uses the touch to focus feature to also set the exposure. It seems not to be the case on the Galaxy and the only way to change the exposure is to point the camera elsewhere (I tried the 3 different exposure settings also). Is there any kind of 'touch to set the exposure' feature in the default or a 3rd party app? The default camera app does seem to get easily confused when there is very dark and bright areas in the scene.