OK, we have partial success.
Collimation was not easier but I could get it better collimated. Still not right but I can tweak it some more.
Images below are Before on the left, after on the right.
Before was shot at native focal length(600mm), while after was shot with 0.73x reducer. I have reduced the 'before' crop to match, so there's a definite improvement!
Please note the 'before' shot was 2 minute exposure while the 'after' shot is only 5 seconds.
Also, the halo's are now gone! Happy
