I've had a Sony RX10 for a few years and have been learning my way around the camera. I've started shooting in Aperture or Shutter priority for most of my shots. I'm struggling when taking picture of people especially if they are moving a little inside and the light is low. I've tried using shutter priority around 1/250 in continuous mode, S focus setting, RAW. The issue I'm having is the quality of the images...some appear to be in focus but very grainy. I'm not sure if it's something I'm doing wrong or the limitations of the camera. Any help appreciated.