I have a new Atik 383L+ with filter wheel. I have Baader LRGB, Ha, SII, OIII filters. This is on a 10" f/4 newtonian which is also a new experience for me. I’ve read through the instructions and searched through this and other forums but for me, setting up autofocus is not intuitive at all regarding which boxes need to be checked and so on. Autofocus works fine for the LRGB filters, it’s the narrow band that need offsets because the autofocus is not reliable with narrow band, at least for me.
So… What I have done so far is to figure out where the focus point of each filter is compared to the Lum filter using a mask. I have them recorded as a +/- steps relative to the Lum. I redid focus on Lum every time to compensate for temp changes as I get wide swings in my climate.
But the focus point in the filter setup window does not accept negative numbers and I see that it expects absolute focuser positions. Focus positions from night to night will be different due to temp changes, focuser slop or backlash, etc… so does it deal with these in a relative matter and the absolute number does not matter? If that is so, why not have it so Lum (or whichever you choose as the focus filter) is zero and we just put in the offset such as 25 or -40 or whatever?
But since it does need absolute position, can those numbers be arbitrary, say setting Lum at 100, Ha at 120, SII at 75? My focus position for Lum is around 18000 with the Rigel focuser and stepper and I can reset the position back to 18000 if I want to in it’s setup menu. But the next night, my focusing may start at 17790 due to a different ambient temp. Will it always run it back to 18000 at the start of the focusing run for Lum? It would start way off if it did.
Do I then check the “autofocus with filter” box and select Lum in the equipment profile manager? I was confused because the pop up tip says only do this if your filters are parfocal which mine are not. But then there is a different setting in the focus dialog of the sequence control panel which is “auto adjust focus per filter”. Is this the one I should use or is it both?
What I really just need it to do is switch to the Lum filter, autofocus, then switch to the desired narrowband filter and apply the focus offset every time it is supposed to autofocus (by temp, time, filter change, etc…)
Sorry for the long post but I’ve gotten fairly confused on how to set this up. 2 nights ago autofocus with narrow band worked fine all night but last night smartfocus went completely the wrong direction and all except the first couple of images were bad.
Thanks for any help,