I also use a "dark" filter for my darks and bias frames but, IIRC, as a filter is irrelevant for darks/bias as the telescope should be capped, you should select the dark filter via the INDI filter wheel tab prior to taking darks/bias as Ekos does not seem to change filters. That's what I do.

Maybe there should be an option in Ekos to use a dark filter instead of, or in addition to capping the telescope. This would make taking darks more automated for those who do not have an automated cap such as the Alnitak or similar.

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