Sony F5 Gets Official 4K (Paid) Upgrade Vlady Radev September 15, 2014 Blog No Comments The official response by Sony to the 4K “Hack” of PMW-F5 is called CBKZ-55FX. In short, this is a 4K upgrade option that enables XAVC 4K/QFHD recording and playback on … [Continue Reading...]