We operate with the focuser always on (no daily restart). At the end of the night the CCD is disconnected. The Focuser stays on focus postion of last filter used. When CCD is powered up, the wheels rotate and go to one given filter (always the same). But the focuser is still in FocusMax on the focus position of previous filter. Next focus offset will then be wrong ?
How do I know what this "startup filter" is? Is it "the" reference filter? Or do you have multiple filter groups, thus more than one reference filter? How can I solve this problem in a general way for users other than TRAPPIST? At present, I assume that if the focuser is left powered up, then so is the camera and filter wheel, thus things remain as they were left. If powered down, I assume the filter and focuser could be anywhere, and it's your responsibility to focus once at the beginning of the night to get the optics set for the temperature and synced to the filters. If you want to avoid the focus at the beginning of the night, I need to know (a) which filter gets selected by the hardware on power up, and (b) where I should set the focuser for this filter.