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Hi, Brendon.
With a rotating head it's very important to have the primary mirror centred.
If you don't have it aligned with the rest of the axis you can never have good colimation.
You may not notice it visually but you definitely do withe finder scope. This being set to one point of collimation, if this is out then when the head is rotated the finder is out.
The other thing, is that this has focal length of 2.1m so a little out on collimation is a long way out with a rotaing head.
Cheers,
Justin
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