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Use 2 autoguiders. One on your dovetail and one on the scope.
Set one to 45 second guide exposures and one for 1-4 seconds like normal.
Per SBIG the slow guide exposure guider would handle flex.
I don't think 70mm is enough for an OAG. They are about 40mm once you add in the adapter on each side of them.
The filter wheel is about 21mm and the Proline chip is about 33mm inside the body.
Greg.
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