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The great Veil nebula
(click and scroll on the image for 4K resolution)




Object:            The Veil nebula, supernova remnant in Cygnus.
Telescopes:   
 Luminance & Color:                    Astrograph  250 f/4 Newton.  Paramount ME.  ATIK 16200 ccd.  Baader Halpha & Oiii; Chroma RGB filters.
                       Background gradient correction: Samyang 135 @ f/2.7.  Artemis 4021 ccd.  Filters: Baader Halpha & Oiii,
Exposures:        12 frames mosaic
Exposures:        Ha : 696 x 400"   ( 77:20 ) 
                          Oiii: 456 x 400"   ( 50:40 ) 
                          R:   132 x   5'      ( 11:00 ) 
                          G:   132 x   5'      ( 11:00 )
                          B:   132 x   5'      ( 11:00 )
                              Total:    161:00 hours

Resolution:       1.4"/pixel.
Date:                July 2021 - August  2022
Site:                
  La Sagra Observatory  Puebla de Don Fadrique (Spain)    - mag 7 professional observatory skies -

Processing (PixInSight):

Luminance & nebula color: Halpha,Oiii channels. Stars color: RGB

Bias, Dark & Flat calibration
Multiscale Gradient Correction
Photometric Color Calibration
Photometric Mosaic
Starnet2
Deconvolution
Histogram stretching
HDRMultiscale Transformation
Color saturation adjustments
Morphological Transformation stars reduction