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Hi Peter.
The following has the caveat that I don't have anything like your system, so it is all FWIW.
Could it be that your guide software is transforming the guide offset data and reporting in RA/DEC, regardless of the guidescope alignment? - the CCDAP manual suggests that may be the case and FWIW, that is what phd does.
It is probably reasonable that turbulence will have more variability in the vertical direction, since it is due to air circulation. Thus, for the average target that goes over close to the zenith, the vertical turbulence motion may show up predominantly in RA at low altitudes - maybe??
also FWIW, my EQ8 has "crud in grease" spikes in RA and it is slowly getting more noticeable as time goes by. I guess that should not be surprising, since anything bigger than about 1/100 the thickness of a human hair will be noticeable.
Last edited by Shiraz; 31-07-2015 at 11:30 AM.
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