A probematic North America (Edoardo Luca Radice (Astroedo))

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: 55 Cyg · 56 Cyg · 57 Cyg · 59 f01 Cyg · 60 Cyg · 62 ksi Cyg · 63 f02 Cyg · B349 · B350 · B351 · B352 · B353 · B355 · B356 · B358 · IC 5068 · IC 5070 · IC 5076 · NGC 6991 · NGC 6996 · NGC 6997 · NGC 7000 · NGC 7026 · NGC 7027 · NGC 7039 · North America nebula · PK084-03.1 · PK086+00.1 · Pelican nebula · Sh2-117 · And 8 more.

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A probematic North America

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A probematic North America

This picture of NGC 7000 was taken in august 2011 with an old Leitz Elmarit 180 mm f/2.8 telephoto lens at f/4.

This old objective has a strong axial chromatic aberration, resulting in star of different sizes in R, G and B channels, as visible in picture B, causing odd halos around bright stars and very green small stars.

So the image remained in the "drawer" for a long time.

Now I've decided to reprocess the image trying to find a workaround for the problem:

After separating RGB channels I've applied deconvolution with different PSF in the different Channels, so I reassembled the RGB image and I have completed processing

The result, although being not exceptional, is quite good so here it is... enjoy!

Questa immagine di NGC 7000 è stata ripresa nell'agosto 2011 con un vecchio teleobiettivo Leitz Elmarit 180 mm f 2.8 a f/4.

Questo vecchio obiettivo ha una forte aberrazione cromatica assiale che provoca stelle di dimensioni diverse in R, G e B , come si vede in figura B.

Questa causa strani aloni colorati intorno alle stelle luminose mentre le stelline deboli apparivano di colo verde acceso

Quindi l'immagine è rimasta nel "cassetto" per lungo tempo.

Ora ho deciso di rielaborare l'immagine cercando di trovare una soluzione per il problema:

Dopo la separazione canali RGB, ho applicato una deconvoluzione con PSF diverse nei diversi canali, quindi ho riassemblato l'immagine RGB e ho completato l'elaborazione

Il risultato, pur non essendo eccezionale, è abbastanza buono, quindi eccolo... godetevelo!

Final
Original
B

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Status	Advanced success
Started	...
Astrometry.net job	275972
PixInsight job	1QPF66R227NMDORZT3P60FSW2CBRHEGZ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h58m29s.57
RA (top/left)	21h12m09s.47
RA (top/right)	20h44m49s.30
RA (bottom/right)	20h46m22s.61
RA (bottom/left)	21h10m37s.80

Dec (center)	+44°47′27″.9
Dec (top/left)	+48°13′19″.1
Dec (top/right)	+48°13′28″.8
Dec (bottom/right)	+41°16′00″.7
Dec (bottom/left)	+41°15′46″.6

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A probematic North America

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