Haven't used the 290MC. I've only used the 224MC with sharpcap for live DSO imaging. For that I'd balance colour as follows for saving raw images
On the right under image controls you can set the colour balance (red & blue). Then you can view the histogram of the image by clicking the histogram button up on the top right. For my rough and ready balance I'd point the camera at a white sheet of paper or even clean bitumen in the shade and adjust the R/B sliders so that the RGB histograms overlapped.
Edit: this was done in sharpcappro 3.1 - hope 2.9 has the same
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