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Looks like some good imaging there Karl
I should have spent the extra few dollars and bought the Premium edition of BYEOS like you have
I was out last night too trying to get some short and long exposures of M42
Guiding was poor early on around 2.5arc sec total when I started imaging Orion was at 25 degrees. Guiding assistant told me my min mo was too low and my PA was >10 arc minutes but I drift aligned using the BYEOS drift tool and my alignment star Rigel was staying in the crosshairs for at least 3 minutes before drifting off , bit strange as I also used the Synscan PA routine which told me I was at approx 2arc min error on alt az
Any guiding improved to 1.7 arcsec by the time Orion was up at 40 degrees
Finished at around 1.00am and captured enough data I hope
I was a nice clear night in Sydney for a change
Cheers
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