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Hi Doug,
I may be wrong but I understand there may be a relationship between the amount of Ha and Hb, and the filter will pick up Hb. So you are probably right there.
To be fair the post probably should be lagoon in O3 and Hb. Having said that some areas havent really come up much either that are strong in Ha I suspect.
Next time I might try some Ha dedicated and see what I can figure out.
Incidentally the halos in the eta carina image were caused by IR leak through the UHCS - fixed by coupling the semi-apo with it. Eventually I'll put an IR filter in the image train instead spaced further from the front filter. That explains the airy disk appearance of these halos.
Cheers
David
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