Will Gauvin replied to the topic 'Missing filter tag in FITS header' in the forum. 1 year ago

If it is the EFW, I think the issue might be that the call to EFWGetPosition is returning -1 while it is still moving. This can then result in ASIWHEEL::QueryFilter() method to fail. I will try to get some debugging on this over the weekend and see if that is the problem

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