Hi Paul, use an app like Sharpcap (free) to get your focus first. It will run as a 10 fps video and you can turn the gain down till you get a sharper image which will allow you to set focus. Then lock the setup and get back to setting up guiding via PHD. Use the camera setting controls in PHD to get a good star image first.
You may also want to try Metaguide as a guiding software. has more controls over exposure etc and is mostly automatic in it's setup.
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