Need help troubleshooting odd colors

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gfunkernator avatar
Two images below, show a slight green-red split horizontally on the frame.  I think it could be tilt, but wanted others to look at it.
This is from ED80 + Optolong L-Pro + TSLFAT2 + ASI2600MC:

This is from 8SE + L-Pro Filter + Starizona SCT IV + ASI2600 MC:


Looking at the common denominators:  ASI2600 and the L-Pro.  I cleaned the filter twice, and didn't notice any flexure in the glass.  So it must be the tilt plate on the 2600 right?
average_pluto_enjoyer avatar

Are you sure it's not just bad sky gradient? I applied a simple background extraction and SCNR in SiriL and got this.
gfunkernator avatar
@average_pluto_enjoyer Thanks for the reply.  Can you run that BG extraction on the other image as well?  I don't have SiriL.  I don't quite think its a sky gradient, because all the subs look like that, throughout the night.  Also noticed the middle of the m106 sub, there's a nasty halo surrounding the target.
wsg avatar
Gradient with a bit of vignette.
You can buy a permanent license for Gradient Exterminator as a PS plug in from RC Astro , the same man who does BXT and NXT.
gfunkernator avatar
Cool thanks.  Processing these for me was a bit of a pain to get the gradient out.
gfunkernator avatar
I think the gradient is coming from my neighbor's lights.  They just either added or decided to turn and leave on a light that hangs above their backyard awning and blast all the sky above my yard.
Lynn K avatar
I agree. Looks like typical gradients.  Tilt will show up as stars deformed in each coner differently.  Color in gradients are not consistent.  It is typical for green to be in the opposite side as red.

Lynn K.