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Definitely persevere with it. Try the blu tak trick, especially if you have a bit of slop in the focus ring. I found that made a big difference in getting as close as I could to focus. After a while you get to know how much you need to turn and its quite easy to nail it.
Btw I don't use the DSLR graphing functions much anymore. I prefer to use the zoom icon set to about 6X and view a fairly faint star until it is all but one singe bright pixel with a few (4) fainter ones at 12, 3, 6, and 9 oclock. Remember to turn the zoom function off before trying to set the capture settings. It tends to lock up the ability to adjust settings until its turned off.
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