So I have this notion about how contrast detection AF works, but I have no idea whether I'm correct. Does the camera body utilize the sensor data exclusively in determining focus? And with a live view sensor, does adjusting exposure settings actually affect the quality of light that enters the sensor, or just the result your LCD screen feeds back to you? I'm wondering whether, say, low-light focusing ability could actually be improved by brightening the exposure, thereby improving the sensor's ability to detect contrast. I doubt it, but I don't know these kind of systems as well as I do the older DSLR focus systems.