Ha/OIII/OIII

This is Steve Loughran’s  narrowband color processing technique by one shot color camera.  Very interesting attempt.  Also you can see other great images as well at his site.  Very nice, Steve!

 

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~ by tedishikawa on October 13, 2010.

2 Responses to “Ha/OIII/OIII”

  1. I’m very new to astroimaging and processing, but Steve has beautifully done one of my favorite summer/fall regions of the sky, around and in the constellation Cygnus.

    Just one thought here with the NAN – it appears that the combo OIII has washed out some of the Ha of the NAN itself, but not of “Mr. Pelican” next door. Both Ha and OIII are very active emission lines from the NAN. I’m unsure as to their relative contributions to the Pelican, but “he” looks a little on the pale side as well.

    However, if Steve is going for a combo Ha and OIII image here, this is mighty fine, as we say down South!!

  2. The image was taken with a Hutech LPS-v4 Nebula filter, allowing in Ha and OIII at the same time, ideal for One Shot Color CCDs. The biggest problem with OIII with a OSC CCD is that it falls almost exactly between the blue and green pixels, at the lower end of the efficiency for both colors. As such, it is very very faint. As the efficiency for both blue and green pixels is almost the same, and the blue and green channels are almost identical, I stacked the 2 green channels with the blue channel in an attempt to gain “extra” data from the OIII. Despite doing this, the OIII channel was still very faint and a little washed out. I was hoping to have a better OIII signel in this image, but its just not strong enough to bring it out that much.

    Also, this isnt a Hubble palette image (no SII), so it wont show the vivid OIII blues that other hubble palette images do. The OII is used in both the blue and green channel, so the lighter red areas are a combination of Ha (red) plus OII (green and blue).

    Its an interesting filter for OSC CCDs, and I will go process the original data agin using the normal RGB stack straight from the camera to see what that will privide me. I`m also interested to see how well it copes with moonglow and OIII… I expect it to be a bit/lot more noisey in the OIII channel.

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