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Thanks Guys
When I was using the Meade filters - the difference in focus was huge so yes I did refocus. With the Astronomik filters I thought they were parfocal (and they looked it) but clearly not OR I am getting some movement (mirror shift) over time.
Clearly I do need to refocus in between filter runs. On the registration front - I'm going to give Polar a go and see how i go without drizzle.
Thanks again.
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