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I've never used an SBIG, but I understand that when you use filters, especially NB filters, the filter reduces light to such an extent that it may be difficult to pick up a guide star. This wouldn't apply to a OSC camera
You could look at the QSI cameras, which come with an option for a built-in off axis guider, so your imaging scope is also the guide scope (so no flexure issues) and the pick-off prism is in front of the filters, so you get full brightness through to your autoguider.
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