Hi Doug,
You may be right. I had a UHCS at the front of the flip mirror. Im hoping bringing the filter closer may somehow help but we'll have to see. The many elements of the flip mirror might be causing a reflection somewhere so I might eliminate that too.
The original subs look quite sharp but when you stack them you get the halo. You can see the central star image fairly sharp and clearly in the image attached.
Hopefully further experimentation will lead to a solution.
Cheers
David
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