If you're shooting with an 8K camera, then why not record in 8K raw format using the Ninja V+ 5.2" 8K HDMI H.265 Raw Recording Monitor from Atomos. The Ninja V+ is the same on-camera monitor/recorder as its predecessor the Ninja V 5", but the Ninja+ now features a 5.2" display and records and plays back up to 8K30 raw video to and from purpose-built mini-SSDs.
The Ninja V+ can record Apple ProRes RAW up to 8K30 or DCI 4K120 directly from the sensor, and it is compatible with an array of cameras. Display features include a 10-bit screen with a brightness of 1000 cd/m? AtomHDR technology for accurate monitoring of your log gamma footage and support for popular log formats from Sony, Canon, JVC, Panasonic, Nikon, RED, Sony, and Z CAM cameras.