The sony fdr ax1 high definition professional camcorder is a high end professional 4k video camera which gives videographers four times the resolution and detail of a full hd camera the sony ax1 records smooth 4khd video in xavc s format which was developed for consumer usage based on the professional xavc 4khd the xavc s format allows for longer recording times storing almost two hours of 4k video on a 64gb xqd memory card making 4k recording easier and more convenient the high quality