ASCOM cameras: do not assume binned subframe size is proportional to full frame
ASCOM cameras: do not assume binned subframe size is proportional to full frame

OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2