ngc6888 and PN G75.5 + 1.7(Crescent and soap bubble nebulae) HO_HOO_RGB (*philippe Gilberton)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · NGC 6888 · Sh2-105

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ngc6888 and PN G75.5 + 1.7(Crescent and soap bubble nebulae) HO_HOO_RGB

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ngc6888 and PN G75.5 + 1.7(Crescent and soap bubble nebulae) HO_HOO_RGB

ngc 6888 and PN G75.5 + 1.7 captured in Halpha and OIII for HOO combination and RGB for star color.
I changed my optical setup in removing the built flat field flattener because I noticed stars eccentricity and blur on the corner. I tried to reduce the problem of the built in flattener in moving it towards the triplet lens but it didn't improve the shape of the stars. It looks to be a bad flattener quality. As promised I bought a TS flat field flattener TSflat2" and the results are much better. To illustrate this, please look at the final revision.

Original
B
E
F
Final
G

B

Description: annotated

Uploaded: ...

E

Description: better star rendering with new optical setup: I removed the built in field flattener from my TS refractor that add star eccentricity and blur in the corner

Uploaded: ...

F

Description: wider field view thanks to the flat field corrector TSFLAT2"

Uploaded: ...

G

Description: revision reprocessed from scratch

Uploaded: ...

ZWO ASI1600MM/QHY163M
Astrophotographes (France)
Narrowband imaging

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Status	Advanced success
Started	...
Astrometry.net job	4896771
PixInsight job	VCT8NSC2MMMIXWSNT8ETTW4QI796H580
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h12m10s.50
RA (top/left)	20h07m53s.85
RA (top/right)	20h16m10s.92
RA (bottom/right)	20h16m30s.75
RA (bottom/left)	20h08m04s.68

Dec (center)	+38°20′14″.2
Dec (top/left)	+37°42′28″.10
Dec (top/right)	+37°38′47″.1
Dec (bottom/right)	+38°57′21″.5
Dec (bottom/left)	+39°01′10″.3

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ngc6888 and PN G75.5 + 1.7(Crescent and soap bubble nebulae) HO_HOO_RGB

ngc6888 and PN G75.5 + 1.7(Crescent and soap bubble nebulae) HO_HOO_RGB

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Image Index:

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ngc6888 and PN G75.5 + 1.7(Crescent and soap bubble nebulae) HO_HOO_RGB

ngc6888 and PN G75.5 + 1.7(Crescent and soap bubble nebulae) HO_HOO_RGB

Equipment

Acquisition details

Description

Comments

Revisions

B

E

F

G

Sky plot

Histogram

In these public groups

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