I am struggling to focus consistently with my Ha and OIII filters. I use 7 points in the run but often they just bounce up and down giving no real curve at all or direction on the optimum focus point. My LRGB are usually pretty good.
I am currently using 30 second focus times for the NB filters. I have Baader LRGB and Astrodon 5nm Ha and OIII so they are not parfocal at all between the two groups.
Should I be trying to determine focus offsets from L for these NB filters? Does SGP have an automated way of arriving at doing these? Any tips for improving my NB focussing?