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Without no DC restoration, the total beam current tends to float to a constant 50% level, that is the average beam current does not follow the average brightness of the scene. With restoration, it goes from zero (all black scene) to twice the average (all white scene). Partial DC restoration means it will float over a smaller range, but it still floats, so there is more DC (average level) than there should be in dark scenes (washing them out) and less than there should be in bright scenes (clipping blacks, but drawing less than max beam current). Of course, on an individual still scene, you could adjust the brightness knob to restore the proper DC level. And then you could see if you have enough regulator current left on that all white scene.
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