IC5070 - NGC7000 NarrowBand

[roberto_volpi]

Two new images

IC5070 Pelikan Nebula
H-alpha : 18x20' binning 1x1
SII : 9x20' binning 2x2
OIII : 9x20' binning 2x2

NGC7000 North America Nebula
H-alpha : 12x20' binning 1x1
SII : 6x20' binning 2x2
OIII : 4x20' binning 2x2

Both images captured from Lainate (urban site) with:
AstroProfessional Apo Triplet 115/800
Sbig ST2000XM
Set Filters Baader Planetarium
External guide with Atik320E on 62/520 refractor
SkyWatcher Eq6 Pro Mount

and mapped as follow

L= H-alpha
R= SII + 0.78xHa
G= 0.15xHa + OIII
B= OIII

Capture and guide software Maxim DL5
Calibration software CCDOPS
3 sigma-clip (Ha-SII-OIII) with Maxim DL5
All other process with Pixinsight

Roberto

Full res
http://2.bp.blogspot.com/-SBWFjG4kNdg/Toa8taaIm_I/AAAAAAAAAcU/D8_3xpghHX4/s1600/IC5070-false-or-JP%2Bcopia.jpg
http://2.bp.blogspot.com/-bDReughmBe8/Toa82U88wgI/AAAAAAAAAcc/A8T6h9ykGgs/s1600/ngc7000-false-JP3.jpg

[Nocturnal]

the end result looks good (aside from the sky which is a bit too dark for my taste) but I don't understand your color combination. You bought expensive NB filters and took the time to collect 3 NB channels. Why do you then mix them? Why attenuate your B channel (Oiii) with your Ha? Now is there's an area where there's Oiii but no Ha the Oiii won't show. That's what Ha as L does.

[roberto_volpi]

Hi Sander and thanks for the feed back.
The problem is not H and OIII, but SII that, under my sub-urbane sky, is realy poor.
I Know that abitual combination is SIIHaOIII, but I try an alternative mappature as exsplaned here
http://www.pixinsight.com/examples/deconvolution/Gemini-NGC5189/en.html

now I'm making another version, traditional Hubble palette (SIIHaOIII)

Best
Roberto