a few variations on the Crescent, aka NGC6888

[richardc]

I recently imaged the Crescent Nebula (NGC6888) using four different emission line filters: [sII], Halpha, [NII] and [OIII]

I assembled the images in different ways, using wavelength ordering in all cases.

the first has [sII], Ha, [OIII] in the so called Hubble Palette (a term I coined, along with CFHT Palette and published in my Aug2005 S&T article: bet you didn't know that!).

the second has all three emission lines assembled in their proper order: [sII] and Ha = Red, [OIII] = Green, [OIII] + 0.3*Ha = Blue

the last shows that the [NII] and Halpha can be split (separated by 2nm) and assigns colors in the wavelength order again: [NII] = red, Halpha = Green, [OIII] = blue

http://www.narrowbandimaging.com/ngc6888_ap180edt_f9_ml4022_cs3nm_s2n2hao3_page.htm

[narrowbandpaul]

that 3rd one does it for me....

i found the s2 to be really quite faint......too faint for scotland :-)

no.2 is pretty ghostly. The sort of thing that would appear in a Stephen King horror.

i like them both. a lot actually.

[richardc]

for some reason I prefer the first one: the [sII]/Ha/[OIII] version

I like the second one next..... it is a reassembly of the emission lines as I was describing for anthony but i just boosted the blue more than it would normally be: I wanted more of the color influenced by it...

[Aza]

Interesting images, I like the second version best for the colourings.

[Paxo]

All goes to show how we have different opinions on 'what looks best' and that there is no 'right way' of doing these.

Steve..

[ncjunk]

Nice set of images, I like the second as well.

Neil C

[johnh]

The second image for me, by the way all 3 are excellent and I do like these comparisons which is handy for narrowband starters to see whats what. JohnH.