Based on a pre-production model Since the GH1 I have been shooting with Panasonic’s mirrorless system for video. Without this series of affordable cameras my early work as a cinematographer and filmmaker simply wouldn’t be the same. The GH4 marks a much needed major leap for the line, the first to shoot 4K to an efficient internal codec AND output 10bit 4:2:2 1080p over HDMI to an affordable external recorder…