I always wondered about our mirrorless cameras since the shutter is always open. When you turn off the camera with a lens mounted, what happens? Does it stay at the last aperture setting or does it go to the smallest hence f/22 to avoid light damaging the sensor in case you forget your lens cap? Can the sensor get "burned" when the camera is off, you are walking around camera strapped around your neck or shoulder and sometimes the lens catches the sunlight? Just wondering is there a safety precaution?