[g__day (Matthew)]

I have Vixen Atlux permanently set up - and after drift aligning it with a CCD and running a 40 star MaxPoint model to confirm - it appears my alignment to the South Celestial Pole is accurate to within 30 arc-seconds.

So on a 600 second shot I see effectively no DEC drift. However I do see about 5 mm star trail in RA. Now given a Canon DSLR normaly prints to a 6" * 4" shot this equates and that 6 inches can just capture the Moon's diammeter being 30 arc-minutes. So a 5mm drift in 600 seconds indicates about 30 * 5 / 150 = 1 arc minute of drift in RA per 10 minutes.

It doesn't matter if PEC is on or off - it seems the RA is just slightly slow.

Is this to be expected and more importantly is there anyway to command the SkySensor2000-PC V2.05 to speed-up the Sideral rate to be 6 arc minutes an hour faster?

Am I likely to see better RA tracking if I change it to unaligned Polar mode and ignore PEC?

Many thanks,

Matthew