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Paul,
Choose a star around the 4-7mag and draw a box around it to instruct the software to only download sub frames. Then monitor the FWHM or intensity values of the star as you tweak the focuser dial. Don't choose a star too bright as this will cause major fluctuations in the readings. Can't recall the specifics of how this is done in CCDSoft, but I used to do it in MaximDL before I went auto i.e. FocusMax and RoboFocus. Now I don't think about focusing, as all the mundane work is done automatically and I can assured I'm always within the CFZ. Need more subs too. You're getting there. CCD work is very different to DSLR.
Look forward to seeing more.
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