that's coma <https://starizona.com/tutorial/coma/>. Common to most SCT's.
The Edge telescope are suppose to take care of most of it. If you don't
have an Edge SCT, you will need to get a FocalReducer/Coma Corrector to
counter this.
James
On Fri, May 31, 2019 at 9:44 AM Michael McDonald <mikemac@xxxxxxxxxxx>
wrote:
I was out playing again last night:
http://www.mikemac.com/Astrophotos/M27-2019-05-30-RGB.png
My capturing is getting a bit better. But my flats are still causing
trouble. Whenever I apply the RGB flats and then do background
neutralization, I introduce a red vignetting:
http://www.mikemac.com/Astrophotos/red-vignette.png
Itâs always a red vignette. Before neutralization, the background can be
cyan or red. But afterwards, itâs always a red vignette.
If anyone has an idea of what Iâm doing wrong and/or how to fix it, Iâd
love to hear from you!
Mike McDonald
mikemac@xxxxxxxxxxx
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