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That is sort of bordering on my tolerance level to halos. But then we are talking about Alnitak here.
It is interesting to see Baader mentioning that in many cases that halos seen are a result of reflections from the camera, passing back though filters and reflecting back again off other optical elements. Given the price of Dons and Chromas, I wonder how much of lack of reflections is down to the likely top dollar glass that is in front of it (If you can afford Astrodons, you are probably not using them with an ED80 or a budget flattener!)
What channels did they show up on in that image? I assume by the colour at least some of it was in HA? You would assume with the Honders that it would have to be from the filters themselves? There isn't anything else to reflect off before the secondary is there?
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