freestar8n
(Post Laureate)
01/30/13 10:18 AM
Re: Celestron VX mount

Quote:

This would be true if NexStar actually had a pointing model...but it doesn't.




I stand by my story. The 2+4 does more than just cone error, and a key item overlooked is the declination offset - which is tied to the index accuracy. For some reason people focus on cone and orthogonality - while the dec. offset is critical to a good alignment and benefits from the additional calibration stars.

Even if you don't move the mount - if there is a slight change in the dec. offset, it can have a big effect on both pointing and ASPA.

Doing a fresh 2+4, as suggested above, takes care of all these concerns, and doesn't take too long.

Frank



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