Same issue here, most FITS files produced lack the filter entry (it intermittently appears in some of the files).

Unfortunately I'm not sure what version of KStars was running since the data is from over a month ago running on a Pi4 I don't have access to right now. Speaking of which: it would be great if KStars/EKOS could record the executable version number in the header.

If I get a chance I might try to debug it, since it's certainly pretty annoying...!

 

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