Quote:
Originally Posted by RickS
You won't get any Hb, Paul. As Kevin said, that's way down in the blues. A 5nm Ha filter will also get NII however, and there is often some of this about. Ha has a wavelength of 656.28nm and NII is at 658.36nm. A 3nm filter cuts out the NII as I found to my chagrin when imaging the Helix. A 5nm filter would have got me combined Ha+NII data and delivered good SNR much faster...
Cheers,
Rick.
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Quote:
Originally Posted by cometcatcher
Yeah Hb is up around 486.1nm. I'd like to see more NB imaging with it. Must not be popular for some reason.
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Ah of course. I had that ballsed up. It was NII I was thinking of. Thanks for the clarification.
