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Glend (Glen),
That's what I would expect correct collimation is done in the factory with out the focuser.
The focuser or Image train would normally be where the problem is, this is why a collimating ring would be used.
So the Image train would need to be collimated as a separate unit then double checked once attached to the scope.
If your RC8 imaging results are as expected then I would not even attempt to collimate the scope it's not as easy as just turning a few collimating screws it is more involved then that.
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