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Thanks Ryan for the encouragement and suggestions
It’s really strange seeing focus drift so much on an ascending object , starting at 35 degrees and arcing up over 70 degrees. I usually spend at least 15 to 20 minutes on nailing my focus as tight as I can. I choose a mag 2 star up at around 50 degrees Alt and take successive 15 sec exposures and use the diffraction spikes and the stars core to nail tight focus. I have a JMI Moto focus fitted to my dual speed focuser with a 2m cable to a 3 speed handcontroller, so I’m sitting right in front of the laptop screen observing each exposure as I tweak the focus. I can then toggle through back and forth and check each exposure until I’m happy, BYEOS has a focus target reticle with zoom control and FWHM read out but I found I can get tighter focus using my visual auto manual method
I “may” capture a whole new set of data on this object when a clear night presents itself in Sydney again ( hopefully a lower Jetstream) and be more rigorous with checking focus
Thanks for commenting
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