I have just started using autofocus, so this is quite probably user error or at least me not using the system properly, but I am hoping that somebody will be able to put me on the right track. The issue is that autofocus ran on the wrong filter for my sequence. Here is what happened:
I was imaging the final sub of the final event for a target with the OIII filter and all was going well. During the sub the temperature dropped by 1 degree so autofocus was waiting to run as I have set it to refocus every 1 degree change. The sub finished and the sequence moved to the next target. It ran an auto centre routine, using the Luminance filter. It then did its autofocus routine, with the current filter, the Luminance filter. The first event of the new target was with the OIII filter, but that was slightly out of focus as the filters are not parfocal. What do I need to do to ensure this doesn’t happen again?
Is it something to do with setting an absolute focus value for each filter? That way when the filter changes from one to another the focus changes by the relative difference between the two filters’ stored focus values? Have I understood that correctly?