The Sony Handycam FDR-AX1 is the most-accessible 4K video camera yet. Ideal for anyone shooting home movies or short films on a tight budget that can’t afford multiple memory cards. It works by capturing video in MPEG-4 AVC/H.264 Long GOP and audio in linear PCM, which all gets saved in an MP4 wrapper. The FDR-AX1 bears a striking resemblance to another Sony camcorder: the HDR-AX2000. Indeed,...