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Imaging telescopes or lenses: Leitz Elmarit-R 180mm f/2.8
Imaging cameras: Canon 350D Baader
Mounts: 10Micron GM2000 QCI Ultraportable
Software: Pixinsight · APT - Astro Photography Tool
Accessory: Baader Planetarium Stronghold
Dates:Aug. 28, 2011
Frames: 31x120" ISO800
Integration: 1.0 hours
Avg. Moon age: 28.82 days
Avg. Moon phase: 0.56%
Astrometry.net job: 275973
RA center: 20h 57' 6"
DEC center: +44° 14' 16"
Orientation: -89.902 degrees
Field radius: 1.014 degrees
Resolution: 700x700
Locations: Bazena - Passo Crocedomini, Breno, Brescia, Italy
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!
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