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Adam, I tend to stand back a couple of feet from the screen and focus on the planet. Going back and forth through focus until I think I have it right. Then I do a quick AVI and run it through registax and do a bit of wavelets. This will tell me for certain how good my focus is. When I first started planetary imaging I did use a hartman mask, but now know what I am looking for in terms of focus. So looking at the screen works best for me.
More practice will afford you the ability to focus by looking at the screen and searching for the detail as it drifts in and out of focus.
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