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hi john,
have you tried for 15-20min subs? I think it will probably be ok.
yes mine changes depending upon the stars. I've had all zero's across the board a few times, whether or not that is actually a reality is another question all together.
I know there are some people who go with the 3 star alignment process but I use 2 star alignment. From memory the manual suggests 3 star alignment to make a more accurate map of a certain part of the sky and to help eliminate cone error.
cheers
rusty
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