Hi all,

I have a question about guiding and guide calibration.  So here’s my problem.

During an imaging session, I will go through guide calibration, start guiding and have a pretty good night (RMS - 0.5 to 0.8). On other nights I will use the exact same set-up, do a guide calibration again, only this time the dec and ra plot graphs will fly wildly off the chart and I have to stop the session as I can’t recover it. Sometimes this will happen during the same session if I slew to another target and do calibration again (should I be doing this?).

My set-up doesn’t change from night to night. My polar alignment is within 7 arc sec. My settings don’t change. My calibration pulse is set to 500. Not sure if this is the correct value but I read on this forum somewhere that’s the value I should use.

Can I re-use a previous nights calibration say from a week ago when I know everything was working? Should I be calibrating when I set-up again?

My mount is a SW AZEQ6GT. When it works I all works, I get really good guiding.

I did read on this forum to ensure my guide calibration has been done properly but it was never explained what “properly” was. So any advice would be appreciated.

Thanks in advance