Weird stars in the corners. Maybe tilt?

[Ovi]

Hello! I have noticed while shooting that the left and right side have pretty bad aberrations (even worse in the corners). My setup is: SW 72ED, StellaMira 0.8x FF/FR, T-ring, Canon 60D. Here's a sub I took a few nights ago:

L_0006_NGC6992_23-08-08__22C_ISO800_300s.CR2

 

Here's a mosaic done with the aberration inspector in PI:

 

And here are some screenshots from CCDInspector. I have no idea what they mean but maybe it helps

 

I'd appreciate it a lot if someone here could help me diagnose the issue present here. My biggest fear is that this is caused by bad sensor alignment from when I astromodded my camera .

 

Edited September 7, 2021 by Ovi

[newbie alert]

Your sensor spacing is wrong.. so too far

Edited September 7, 2021 by newbie alert
Added info

[Ovi]

4 hours ago, newbie alert said:

Your sensor spacing is wrong.. so too far

How should I go about fixing it?

[newbie alert]

10 hours ago, Ovi said:

How should I go about fixing it?

Reduce the distance from the reducer to sensor

[sharkmelley]

You definitely have a strong left/right tilt.  The stars in the central column are looking quite reasonable.  It's possible you have a spacing issue as well.

Mark

Edited September 13, 2021 by sharkmelley

[Adam J]

Three things going on here.

 

1) You have too much back spacing from the flattner

2) You have sensor tilt. 

 

3) You potentially have a slight colimation error, but you need to fix 1 and 2 and then reassess that.

 

Test and adjust in that order. 

Adam