Well, i donīt know how much knowledge and experience you have with the manual Exposure in Video and Photographic Cameras, but using a camera like the Chronos requires quite some of that.
This camera has, as far as i am aware, NO Automatic Exposure Mode or any other kind of Automatic Mode.
That means, that you will most likely have to adjust your setting for your Lighting Situation, almost every time you want to capture something with it.
So, it is kind of normal, that the result is bad, if you just unbox your chronos, power it on, and hit the record-trigger....
You will need to adjust your settings everytime or have to have the same Lighting all the time to get reasonable results. Otherwise you will end up with Videos which are to bright or too dark (or out of focus, if you dont focus correctly...btw: Chronos has no Autofocus, if you dont allready know that...).
I would recomend you to look up some tutorials/ videos on How to use Manual Exposure Mode on Photographic/ video-Cameras, that will explain a lot and will help you to find the right settings for this kind of camera.
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Not sure what that flickering you get is all about, but a lot of light sources in your everyday life will flicker when filmed in slow motion. Most people cant see that with their bare eyes, but the Chronos can see that very well!
Try filming in bright sunlight, if you get that same kind of flickering, it is most likely caused by the Chronos.
Otherwise, If this flickering is not visible with only the sun as light, it is probably caused by whatever lightsource you are using.
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Also, you need tons of light for a highspeed-Camera to get good Image Quality.
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Hope that heped a bit with your problem.