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I don't do mono (Yet) but for instance SGP does do filter offsets, so you can focus on Lum with an offset applied (That you need to work out for yourself) for each other filter, though RGB filters should be easy to focus through, NB filters can be tougher.
Target change, elapsed time, and temp change are all good triggers, also possibly filter changes as well as otherwise you might find it changing filters then promptly going back to LUM to focus as it was nearly due on one of the other filters. How many degrees temperature change to trigger a focus run is something you need to work out on a scope by scope basis. My SCT just about needs it every half a degree but my SVX80 probably only needs it every couple of degrees. I do that one at sequence start, every two degrees, on pointing change, on meridian flip and once per hour.
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