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Found 2 results

  1. We were quite pleased with our snap of the Bat Nebula https://stargazerslounge.com/topic/280222-bat-nebula-eastern-veil-bicolour/ until, that is, we saw this masterpiece from Bill Snyder http://billsnyderastrophotography.com/wp-content/uploads/2013/11/Eastern-Veil-CFHT-Ha-OIII-SII-PS1-V4-CR.jpg Mr Snyder had used all three NB filters, but it was not at all clear to us how he achieved the final result. We captured a couple of SII frames and tried doing multiple different combinations and blends but got nowhere near. So eventually @MrsGnomus e-mailed Bill. He got back to her fairly quickly and said that he started off with a reasonably conventional SHO (Hubble) mix. He then started by following Bob Franke's method - http://www.bf-astro.com/hubbleP.htm I got the SII - last night with a ludicrously bright 'supermoon' looking on. It was noticeable just how much brighter our 'black' level was with the moon around even with the 3nm Astrodon filter. Also the Veil is really getting a bit too low in the sky I think. All told we got around 3 hours of SII last night to go with the 5 hours of Ha and 3 hours 40 mins of OIII. I did a SHO combination - followed by the Franke method and then I got decidedly trigger-happy with the Selective Colour tool in PS. I don't think I would be able to reproduce what I did. I didn't get anywhere near the Snyder image, but the result was 'interesting'. Our bicolour shot is better. Nevertheless, I might try to get some better SII next year when conditions are more favourable. The main lesson we learned was not to try imaging during a near full moon even with 3nm filters. (We simultaneously tried getting some 3nm OIII through our widefield rig - the individual subs looked OK but once processed, it was clear that there was a massive gradient running across the frame which DBE only partially eliminated.) Comments and criticism welcomed as always - this is certainly more of a work-in-progress than a finished effort ....
  2. From the album: DSO

    2017-Oct-12 Eastern Veil Hyperstar, QHY8L, 9x5m Processed with APP, Nebulosity, and MATLAB.
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