Thank you Ray, that is a very useful write up and post. It helps me understand a couple of things I had read but never saw the explanation for.
Cheers for that.
Ken, they do seem popular all round at the moment. If it doubles as a good solar cam then all the better but I gather most good planetary cams would suffice. I'm just finally coming to terms with my DMK41but it lacks the frame rate for planets.
What was/is the dust issue?