Alex replied to the topic 'Guiding failing when changing filter' in the forum. 2 years ago

Yes, that's true that of course both cameras move with the focusser.
The magnitude of the offset is very small though, I'd be surprised if it makes much difference to the guide camera directly.

I've definitely got to get one of those helical focussers, I didn't realise they made them as an add-on for the smaller ZWO OAG.

So what do I do? At the moment as far as I can tell the guide cam is focused as well as I can get it.
When the focus moves, guiding temporarily goes crazy, with large adjustments, that take a while to settle out again, meanwhile the imaging cam exposure that just started, is aborted due to the large guide error.
Once the (erroneous?) large guide pulse has settled out, guiding continues correctly and imaging restarts, but I've lost a significant amount of time.

A delay option, or an option to suspend guiding while moving for filter offsets would fix the problem, but unless I'm missing something there doesn't seem to be such an option. There is when auto focussing, but that doesn't work here.

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