I had a chance to do some imaging tonight with the fresh install of Astroberry (Kstars 3.5.5). All of the images that I've checked had the FILTER keyword in the Fits Header. This is the same hardware as before (Raspberry Pi 4 with 64 GB SD card, same gear attached). For me at least, the problem only appeared after reinstalling the OS and upgrading to Kstars 3.6.0. When I find the time, I will install Astroberry on a spare SD card and update the version of Kstars on it from 3.5.5 to 3.6.0. Perhaps I will find time this weekend.
Cheers,

Wim

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