Mirror shift has nothing to do with polar alignment
Once aligned that's it it its "permanent" and doesn't change when you move to different stars arond the sky It has nothing to do with the mirror
Its the latitude and asmuth angles of the scope
If your getting movement its either flexture of the mount or
IMO you are describing "PE" the slight "
squirrelly" drive changes from the worm wheel
BTW LOCK the mirror in place to prevent shift ALWAYS
Quote:
Originally Posted by g__day
This is a question for anyone who has really tried to nail polar alignment on a permanent mount using an SCT ......
..... until I discovered mirror movement was confounding ultra precise alignment......
Many thanks,
Matt
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