Mike,

I haven't considered using stacked paper for flats.  That will be another idea to try should my grey T-shirt and Light Box method fail.

I have attempted stacking my data without flats once.  What I discovered was that there was a lot of vignetting, otherwise the image was fairly clean looking.

I did give a once over on what Bulrichi wrote.  Even though I don't use PixInsight he had a lot of helpful information.  I am still kind of fuzzy on a lot of the terminology but this article helps.

This evening I took some Flats using my UHC-2 filter.  I think the captured image might help in conveying what to me poses a problem.  This of course is what shows up while in Ekos Capture mode.  I'm assuming that the frame is stretched in the FITS viewer.  It does look totally different upon import on my MacBook Pro.
Mike,

I haven't considered using stacked paper for flats.  That will be another idea to try should my grey T-shirt and Light Box method fail.

I have attempted stacking my data without flats once.  What I discovered was that there was a lot of vignetting, otherwise the image was fairly clean looking.

I did give a once over on what Bulrichi wrote.  Even though I don't use PixInsight he had a lot of helpful information.  I am still kind of fuzzy on a lot of the terminology but this article helps.

This evening I took some Flats using my UHC-2 filter.  I think the captured image might help in conveying what to me poses a problem.  This of course is what shows up while in Ekos Capture mode.  I'm assuming that the frame is stretched in the FITS viewer.  It does look totally different upon import on my MacBook Pro.

  

This shows how inflated the Red values can be.

Since there is such a variance with the ADU values I am wondering whether this would be considered a good flat frame?  If not how would my capture technique need to differ to get this to a better result?

Sorry for invading your tutorial sticky thread.  I am hoping that in getting an understanding of what constitutes a good restricted band flat image that it might be helpful to others with this camera.

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