4k internal recording is superb. The camera supports F-Log and F-Log 2 to get a wider dynamic range. Internal 10-bit 4:2:2 recording also gives you more to work with in post-production. There’s no time limit on recording, which is great for long-form content, although it can occasionally overheat and shut down during long recording sessions at higher resolutions.
The exceptionally high bit rates noted above were achieved when shooting in ProRes 422 HQ. When using H.265 All-Intra, the max bit rate we got was 699 Mbps, and the minimum was 108 Mbps. The bit rates you get will vary depending on the file format, codec, and other settings.
In 8k, using the ProRes 422 HQ codec, you’ll get even higher bit rates, with a max of 3263 Mbps and a minimum of 2749 Mbps. With H.265, we got a max of 684 Mbps and a min of 93 Mbps. When shooting in 8k, the camera is also quicker to overheat, but Fujifilm sells a cooling fan that screws onto the back of the camera for extended 8k recording. However, we haven’t tested the camera with the cooling fan, so we can’t say how effective it is at reducing overheating.
