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Unless you manually have ways to limit the gain – it will automatically raise on it’s own, and often to unwanted levels.
Make sure you are either manually adjusting the iris and gain and visibly see the “dB” on your display. If there are manual gain hold switches, set them and use them and you can set the iris to your heart’s content without worrying about the gain going anywhere. I am not sure how the FX7 works, but the Z5 has 3 settings High/Medium/Low. I have mine set -3, 3, and 9. Most would set the highest at 6, but doing weddings myself I know how dark some venues are. The last option would be to set the AGC (automatic gain control) to keep the camera from going too high period.
Personally, using the iris ring to control everything is the best, but in dark situations when I may be zooming a bit more, I will turn on my 9dB to make sure a long zoom doesnt crank it up out of control. Once I have a shot set, I make sure to turn off the gain switch feature again, otherwise I may end up needlessly using 9dB gain in a shot that I may get away with even no gain or -3 or -6 by mistake.
Another good use for the pre-set gain settings I have found is when I am solo-shooting with multiple cameras outdoors. I will often set un manned cameras to full automatic, especially partly cloudy days when the light is constantly changing. The problem is the camera, no matter what the lighting, when set to automatic will default to 0dB gain at its lowest setting. So, I just turn on manual gain only, and make sure it is at its lowest setting (-6dB).
I have not had any experience with the FX7, but with the Z5 I absolutely hate having to go above 9dB unless absolutely necessary. I have done 12dB at times, but more often than not I and up throwing heavy effects on those shots to cover up the grain.