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Leon, I use Backyard EOS programme on my laptop. It has a focus screen/programme where you can magnify the star as much as you like. Then I focus manually til the star is the smallest I can get. It also has FWHM and HFD methods of focussing. Costs about $50 to $60 I think, one off buy. I think it also has a free trial period. I also use BYEOS imaging programme for taking the photos.
Cheers, Rob
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