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Hi Peter,
I was using a UHCS with a little more cutoff in the blue.
The stars showing more halo didnt look blue to me but it could be CA I guess. As you say could be focus but I'm suspicious of internal reflections off the filter perhaps. Will try it next time with an 03 in the filter slider only and see what effect that has also with the flip mirror assembly removed.
Cheers
David
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