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Andrew,
I use the Live focus function. What i do is center on a star (usually the precise goto selected star just before final slewing), switch from Bulb to the live view function 1 which zooms right into the center screen, re-center the star, switch to live view function 2, extreme zoom of the centre screen, then, using the Hartmann mask make my final finer focus.
works great. The Live view allows me to see the star being focussed magnified as if through a high power EP
f
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