I use an ao8 and I am just setting up a moag/aol/stl combo. Again like mark I cannot comment on the orion.
I pretty much have to use a rotator in conjuction with the skys fov indicator to get great results, especially for the postage stamp fov you will have for the guider. It will make a huge difference to your image sharpness if you make the effort to make it work.
Brett
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