Is this the best I can do with a C8SE SCT?

[DaveS]

I would mount a rotator between the camera and the OAG, either the TS 48 mm or TS 42 mm depending on the thread size.

[oymd]

1 hour ago, DaveS said:

I would mount a rotator between the camera and the OAG, either the TS 48 mm or TS 42 mm depending on the thread size.

Ahhh....

That's a nice trick!

I have a T42 rotator lying somewhere! Its a TS optics one!

[newbie alert]

On 16/05/2022 at 09:43, alacant said:

OK. So, as the 0.63's 105mm isn't critical, I'd go for plumber's teflon thread tape. Or, as it seem to be working OK, just leave it?

HTH

I'd say the 105 spacing  spec isn't accurate, but the spacing is, the XLT will never achieve a perfectly flat frame but you want the stars at the edges to be the best they can... With a SCT, spacing / collimation have to be fairly good to have acceptable results...