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I tried it last night this way, just had to find a guide star that wasn't inside the blemish in the prism.
It was so much easier to measure the focuser travel than trying to measure the travel of the guide camera on the stalk, I had been fiddling around in the dark with a caliper for several nights. This way I had it measured and focused in two adjustments.
It works just as well with a star if the moons not up or no distant objects can be seen.
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