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Some great tips there Paul. Thanks.
I think I'll go with FocusMax. I have the full version trial and I'll get it going.
So do you slew to an appropriate focus star every hour then have the original image reacquired? One advantage of @focus2 and the Sky X is that is automated. Can you automate that with FocusMax or does it require additional software like CCDcommander?
Good tip about the temperature compensation. It might also be the rate of expansion/contraction may not linear with temperature changes.
The RHA has a small critical focus zone and F3.8 is going to mean spot on focus is vital.
The goo news for me is the FLI Atlas is working with my setup without too much of a bother which is great. It is working in CCDsoft but it requires the Sky X to be running at the same time (which it does anyway as I use Sky X to run my mount).
Sky X also has filter offsets for different focus settings for each filter plus it has dithering for the autoguider. So some nice features there. Also you can program as many filters as you want in an imaging run. For some reason CCDSoft was crippled to only do a max of 5.
Greg.
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