Hi,

i think (almost?) every ZWO camera has high-speed built in. By reducing the ADC bit depth it can speed up captures (in some cameras capture-rate doubles). This mode is not useful for deep-sky, but mainly for high-speed video capture. But this will have impact on Dynamic Range. Sometimes I use that if I want to capture ISS transits. There I need high-frame rate, and can afford less dynamic range. In planetary 8bit recordings are often used and higher capture speeds can be achieved. (However these are mostly dependant on exposure time).

Paul

That is what I read on the internet about high speed mode too. Funny enough, I do not see the ADC width reduction with my ASI294MC (that is MC, not MM). I kinda see a slight difference in dark noise patterns with high speed enabled or disabled. But in both cases the data numbers seem quantized at 14 bit. I guess, this is why I had this mode enabled, apparently harmless. Better disable it for good.