The "D" version used the Narrowband Assistant PI script from
@Alex Woronow . The O-III did not come out as prominantly as I would have liked I think because it overlapped with strong H-alpha and S-III signals. Even after some manipulation with 3D LUT. So I favor the Dynamic Combo method.
Both used GHS stretching and the stars in both are from NB Assistant:
GHS Forum DiscussionIf you are interested, this is the dynamic combination recipe:
Dynamic ComboPrior versions (Great advantage of the ASI6200 is the huge chip to allow relatively wide fields and multiple objects):
Bubble (Sh2 162) DEEP SKY WEST (DSW) 
Sh2 161 
Sh2 159 H-alpha RGB From GalaxyMap:This includes the Bubble nebula, NGC 7635, a circular shell around the O6.5 IIIf star
BD +60°2522. The nebula also contains the infrared cluster [url=
http://simbad.u-strasbg.fr/simbad/sim-id?Ident=[BDS2003]+44&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id][BDS2003] 44[/url].
This also includes NGC 7538, a major star formation region in the
Cas OB2 association. It is surrounded by the much larger diffuse nebula Sh 2-161B.
The main ionising star for this nebula is the O7 V star [url=
http://simbad.u-strasbg.fr/simbad/sim-id?Ident=[WBN74]+NGC+7538+IRS+6&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id][WBN74] NGC 7538 IRS 6[/url], but it includes several other O-stars as well.
Avedisova places Sh 2-158 in star formation region
111.54+0.82 with 101 components including 15 masers and the young stellar object
NGC 7538 IRS 9.
Russeil combines Sh 2-158 and Sh 2-159 into one star formation region.
GENERAL NOTE ON SHARPLESS2 OBJECTS>>>>>>>>>>>>>There are 313 Sh2 objects. All now imaged.
This is my collection:
Sharpless2Wide-Angle Hydrogen Alpha Nikon Image Sh2 79-171Please note there is also a Sharpless2 Group with now more than 2700 examples.
Sharpless2 GroupOther useful links include:
Gary Imm's CollectionGalaxyMap's CollectionThe Sharpless CatalogThe MDW H-alpha Sky SurveyReiner Vogel's detailed observing catalogHope you enjoy these obscure but interesting objects...
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