My L-Extreme does halo on very bright stars, but then, so did my Enhance. It does seem worse/more noticeable on this though, which makes sense given the Oiii band is much tighter (7nm vs 24nm). Proper Oiii narrowband filters will also produce halos for the most part, except for Astrodon and Chroma.
I'll be choosing my targets carefully with this filter to avoid it. So far I've used it on Tarantula Nebula and Carina Nebula with good results and no halos, but they lack the super bright stars you see around M42.
I was going to sell my Enhance but might keep it for a while just in case.
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