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Hi hougy, I use the WO minus violet filter that came with the Zenithstar 80 package. I also have the Baader IR/UV block filter. Both help wth violet fringing. The WO seems better at reducing that violet fringing on the moon and venus, but it does (as Justin mentions for the Baader fringe killer) seem to give a yellow tint but doesn't trouble me. The Baader fringe killer might be better if you want to do CCD imaging as it also kills the IR end of the spectrum.
cheers,
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