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 · HD191396 · HD191397 · HD191424 · HD191472 · HD192003 · HD192020 · HD192041 · HD192078 · HD192102 · HD192123 · HD192163 · HD192182 · HD192303 · HD192361 · HD192422 · HD192443 · HD192444 · HD192537 · HD192744 · HD192766 · HD192934 · HD227860 · HD227870 · HD227912 · HD227929 · HD227957 · HD227976 · HD227990 · HD227991 · And 73 more.

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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: ...

Astrophotographes (France)
Narrowband imaging
ZWO ASI1600MM/QHY163M

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Status	Advanced success
Started	...
Astrometry.net job	8763609
PixInsight job	QT9ADZ3ELV4ICWKGE21U74XE7XSYD2I3
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h12m10s.70
RA (top/left)	20h07m53s.75
RA (top/right)	20h16m10s.98
RA (bottom/right)	20h16m30s.50
RA (bottom/left)	20h08m04s.59

Dec (center)	+38°20′13″.10
Dec (top/left)	+37°42′28″.4
Dec (top/right)	+37°38′46″.1
Dec (bottom/right)	+38°57′20″.5
Dec (bottom/left)	+39°01′09″.5

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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

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E

F

G

Sky plot

Histogram

In these public groups

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