Hi James,
Only flats are bias substracted when creating master Flat.
Light frames were Dark and flat substracted from master dark and master flat.
The issue persisted accross all following scenerio
- No reduction
- Only Dark reduction
- Dark and flat reduction
I will have to go back home tonight to upload few pics and give some additional info on background ADU levels at which this happens.
Regards
sad
Quote:
Originally Posted by Moon
I hope the camera is ok!
Did you try to process without bias frames?
I found my STL bias frame somewhat unrelable and I had cases where they introduced errors into the final image (probably operator error of course).
So I just use the basic technique (darks + flats) without bias frames. You can still get good results without bias frames on the STL.
James
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