QHY8L OSC artifact problem

[MarkS]

So, let me get this straight - it was operator error 

In my defence, nowhere does it say or warn you that it treats single calibration files any differently to sets of calibration files.

[RobertM]

True, but it should do. I think I tripped over a similar thing when I used DSS for calibration but it never gave me good results and took too long so I binned it in frustration.  I'd have expected the software to have improved a lot since then but even so the documentation of Astro software (especially freeware) leaves a lot to be desired.

We all fall into these traps from time to time, it's part of the fun of it

Robert

[MarkS]

Similarly with me.  I stopped using it a long time time ago because of inconsistent and incorrect results.   Maybe this partly explains those previous problems.