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IC4592 - the Blue Horse Head nebula

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Object:             IC4592, the Blue Horse Head nebula in Scorpius.
Telescope:       Sky-Watcher Esprit 80 triplet Apo & flattener (f/5 - 400mm).
Camera:           DSLR Canon 6D. Original IR filter replaced (Astrodon Inside).
Exposures:       18 x 15'  (4:30 h)
Mount:              Sky-Watcher AZ-EQ5          
Guiding:            Moravian G1-2000 ccd, 50mm finder.
Date:                 May 2020  
Site:                  Observatorio de La Sagra  Granada (Spain) 
Bias, Darks & Flat calibration
LinearFit  pixel rejection combining
Photometric Color Calibration
Histogram stretch

Curves and Histogram adjustments