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I use a bahtinov mask to get focus. This gets things good enough for eaa and basic imaging. I use the ASIAIR pro with the ASIAIR app on my iPad. It gives me all the functionality of focus routine (auto focus as well if you have zwo products), calibration subs, imaging etc wirelessly without another computer.
The focus point will always be different every time you change cameras or even changing filters, but very easy to get fairly accurate with an sct especially when you’re looking at a live view on iPad. Unless you’re doing something crazy you won’t ever run out of focus.
My process with the cpc:
Setup scope and imaging gear + uhc or uv-ir filter (20min)
Align scope 3star alignment on cpc (5min)
GOTO bright star and focus with mask on ASIAIR app (2min)
Take flat calibration frames with ASIAIR app (2min)
I reuse my darks and bias frames
GOTO imaging target
Preview
Setup livestacking and hit start
Enjoy!!
I’ve found my cpc to hold focus very well. I generally only need to refocus between targets if I change filters.
ASIAIR can also save all the subs during live stacking for processing later if you want. It has a histogram slider that you can use to get the best balance of contrast and detail during the live view.
I don’t mean to sound like a salesman for zwo- but when it comes to eaa - I’m not sure if there’s a better system out there...? If you want to go full-blown imaging I think there’s more functionality on some of the pc based systems.
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