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btw, make sure you have the save on CF card checked rather than on the PC. It makes it a lot quicker.
As a rough guide set your ISO to 800 and your Tv to 4 or 5 sec. That will be long enough. Don't select a really bright star, you want one that is fairly dim for the focusing to work effectively. Using the magnifier what you are looking for is a central bright pixel with fainter ones around and small unseen stars popping into visibility when you are at the critical focus.
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