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There is no point using the AO unless you are imaging through it. You can swap the sensors with CCDSoft and use the main CCD for guiding but this won't help a second camera that isn't looking through the AO unit.
I use an Atik camera on one scope and my SBIG with AO on another side by side. I can guide with the Atik and image with the SBIG using the AO to correct as well but not the reverse.
The AO unit doesn't move the mount unless the guide star has moved more than 50% of the AO travel range. If I was imaging with the Atik at the same time it would have wandered too much before the mount started to guide.
I regularly image through both scopes simultaneously using a STi guider on the scope with the Atik camera on it. This guides both scopes perfectly well.
I have a reason for doing this but most people won't find much need to image the same target with 2 camera.
I take photometry with one and a spectra of the same target with the other.
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