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Wow - thats one of the best achromat photos Ive seen. By the way that Eq6 of yours really does track well doesnt it!
People are happy to shoot through achromatic camera lenses but rarely seem to bother too much with achromatic refractors which seems a little ironic.
You could try a baader uhcs filter. It knocks out some light pollution, reduces blue fringing and seems to accentuate the Ha. I have tried this on my vixen neoachromat with good effect (posted an image some time back of eta carina).
Suspect a baader contrast booster would also reduce the fringing - or just keep doing what your doing with the processing.
Looks fantastic!
David
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