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What are you using to control your capture Chris? There is a free program called QCFocus (QuickCam) that you can use to both capture and focus. I have not used it but you could try it. I use K3CCDTools V3 which has a great focus assist built in. But as Stuart has says it is much easier to focus on a star, or if one is available, a mountain just peeking over the terminator and you focus on the mountain top.
At the FOV you are getting it is going to be tough to get a nice crisp image anyway. Try using a barlow, taking multiple higher res shots and then mosaicing them to capture that nice crisp large moon.
If none of these are options then you can focus as Stuart has says with a hartmann mask or even laying two pieces of dowel across the aperture in a cross.
Good luck with it.
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