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My best focussing so far has been a simple long exposure, in fine jpeg, with guiding off, and turning the focus dial a couple of graduations every five seconds, "Home made dial graduations" then picking the sharpest part of the trial, and approaching that graduation in the same direction, Seems to be fairly effective and you know what your going to get...you can use the LCD on the camera even if pushed and zoom it...
2 cents..
S
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