One of the great new additions to the Sony FX9 is the dual native ISO. On the FS7, when in Slog, the base ISO was 2000, which was too high for daylight filming, and not quite high enough for low light filming. But now on the FX9 with the addition of a dual native ISO, the native ISO's of 800 (on the lower circuit) and 4000 (on the higher circuit). This means the FX9 is much more accustomed to shooting both at normal daylight levels and in much darker environments.
Of course, I would encourage you to watch the video above to get a much better grasp of how the noise levels perform at each ISO, but we saw minimal colour shift throughout the range, and we were really impressed at how close each native ISO matched in terms of noise. This will mean that you'll get much better performance in low light scenes if using the higher base iso of 4000. If you need to bump your iso up say from 800, you may be better off jumping all the way to 4000 or the higher base to get lower noise levels in your footage as no gain will be applied to the image.
Below you'll find a few stills for reference, but notice how the noise levels between ISO 6400 on the low base and 12800 on the high base are on very similar levels. This really shows why a dual native ISO is such a great thing, especially in a camera such as the FX9 which will be used in a wide range of situations.
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