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" I don’t fully understand the significance of the offset. I understand why it needs to be so, and SW state in the manual that it has been offset at the factory. Since I have removed the secondary and refitted it, have I destroyed that and need to reset it? "
Hi Dunk,
What Skywatcher means is that the secondary mirror itself has the offset built into it. In this image attached your secondary should look like the one on the right hand side.
Cheers
Bill
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