Re: Stars drift with high resolution encoders

Don W

What can you do? - Not much.  7 million tics is not very accurate - you can expect to track within a couple arc-sec - the diameter of a star.

Alt-Az mounts must track in both axis.  Cascade mode needs a lot more tics/rev with a Servo II to work.  Precise mode tries to keep the pointing accurate, but your resolution won't do it.  Polite mode seems to work because it only tries to correct occasionally.

realize that the Alt-Az mount tracks at varying rates across the sky, not a constant rate ever.

Don W

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