When coupled with the Atomos Ninja V, the Nikon Z6 will output RAW video over HDMI -- similar to what the Blackmagic Pocket Cinema Camera 4K can do internally. RAW video capture, similar to RAW photos, preserves more data than compressed formats and allows you to record more color and capture more detail in the shadows and highlights. This firmware update makes the Nikon Z6 with the Atomos Ninja v recorder one of the most competitive video kits on the market, competing with high end cinema cameras costing tens of thousands of dollars.
The next most immediate specification to consider would be the frame rate that your video camera allows you to record in. Top-of-the-line video cameras record at 4K resolution and 60 frames per second (fps), giving your footage that smooth, slow-motion cinema look that everybody loves. This is a highly sought-after capability and only a select few cameras on the market (excluding high-end cinema systems) provide this feature.
Another highly sought-after, and relatively exclusive, feature within the video camera realm is the ability to record in RAW or ProRes. These are uncompressed formats that maximize the information gathered by the sensor and provide you with extended flexibility when it comes to color grading and post-processing. As mentioned, this feature is quite an exclusive one and only available in a select few cameras on the market with good processors (again, excluding high-end cinema systems). Some select cameras can record in ProRes Raw with an Atomos Ninja V external recorder. Nauticam offers a housing for the Ninja V for use with your underwater system.