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How often do you focus?
I did a run of HaLRGB subs tonight on my ED80 requesting Sequence Generator Pro rotate through the events and to autofocus on each filter change. This meant autofocusing on every shot. The file name had the time and position of the stepper motor recorded in it so I could see what was happening with focus and could estimate filter offsets. What I wasn’t expecting was the rate of change of the focuser position - 300 steps every 25 minutes. When autofocusing there is a zone around the actual focus point of about 150 steps either side where it’s all pretty much okay but 300 steps is still quite significant. How often do others focus during an imaging session? It seems I should be focusing every 15-20 minutes?
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