Quote:
Originally Posted by jase
Good effort. Had a closer look at the larger version - http://www.gco.org.au/st8/C14_Images/GC2070-RGB.jpg
You could almost mistake this image for a narrowband image instead of a conventional HaRGB blend. Not sure what happened there...still some great details on display - attributed to the Ha data no doubt. Managing stars in HaRGB blends is difficult and I suspect you experienced this. The stars from the Ha data are tight and small compared to broader filters such a LRGB. Its near impossible to use the Ha data alone for luminance. I think the image would have been better if you also capture some luminance or created a synthetic from the RGB data. This would bring the stars back and provide a more asthetic image. Perhaps next time...look forward to seeing more. |
Hi Jase,
Thanks for your comments. The reason it looks different, is that Astronomik have produced a wider band Ha filter in the 13nm region, rather than the "normal" 6nm range. When we compared the 2 filters side-by-side, we found that the new 13nm Ha filter allowed a lot more detail in on a broader range of objects, plus provided a better selection of guide stars with the wider band pass.
Therefore, we obtained the new typeII LRGB set, with a Ha 13nm, SII and OIII set for our 10 position filter wheel with the ST-8 on the C14 @f/6.9.
Although the "balance" of adding RGB 10min exposures to this 1 HOUR LONG Ha image, instead of a L channel, is somewhat of a ascetic blend as there really is no real reference to use. Only the RGB channels were balanced.
however I to can understand the time and effort that went into capturing this object, certainly well captured, and plenty of great detail, but the colours just seen so.........don't know. 
