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Hi Garth..
Just putting in my 2 cents worth...
I have been doing astrohphotgraphy for just under a year now...so my experience is also limited.
I have always used a separate guide scope and made sure that its focal length was always the same as or longer than the main imaging scope as this will result in more accurate tracking.
I have recently purchased a QSIwsg-8 which has an off axis guider. I only used it once and as was mentioned before you do need more sensitive guide cam like a lodestar to pick guide stars. I have returned for a separate guide scope for now....until i purchase a Lodestar.
hope that helps
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