If you invest in a copy of Back Yard EOS, it has a focussing tool that is very simple to use. Just keep tweaking until it gives you the lowest number.
If you aren't using a field flattener you can use the Lens Distortion filter in Photo Shop to correct the field. It's in the Filter section.
I use it all the time with my new scope, it works a treat.
Love the pics btw.
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