What if Sony’s camera has so much more power internally than what they expose? We have seen Canon cameras getting a performance boost via
hacked custom firmware – Magic Lantern, so the idea is not unthinkable.
Now, youtube user Nabil Fathi claims to have hacked the Sony A7S to record 4K internally, along with providing higher bitrate and better subsampling (HDMI 10bit 422). The message was attached to a video Nabil uploaded to Youtube: