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M8-Lagoon-3nights_DSS_Siril_AP

DSO

M8-Lagoon-3nights_DSS_Siril_AP

The Lagoon nebula (M8), obtained by stacking the FITS from three nights (one in June 2020, and two more lately). Once again I was heartless when rejecting FITS, until I was reduced to the 731 very best.
Then I stacked them in DSS, did colour calibration and stretching (2 Asinh, one automatic) in SiriL.
Then I post-processed in Affinity Photo, once again using frequency calibration to apply different treatments to the stars and the nebula. I find it helps me keep the stars very sharp.
I also collected 66 new dark frames to get a masterdark for 20°C, as the nights are getting so warm now.
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731 x 10'' (2h 2m)
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Stacking mode: Intersection
Alignment method: Automatic
Stacking step 1 ->244 frames (Gain: 200) - total exposure: 40 mn 40 s
RGB Channels Background Calibration: No
Per Channel Background Calibration: No
Method: Median Kappa-Sigma (Kappa = 2.00, Iterations = 5)
-> No Offset -> Dark: 1 frames (Gain : 200) exposure: 10 s
-> No Flat
Stacking step 2 ->31 frames (Gain: 200) - total exposure: 5 mn 10 s
RGB Channels Background Calibration: No
Per Channel Background Calibration: No
Method: Median Kappa-Sigma (Kappa = 2.00, Iterations = 5)
-> No Offset -> Dark: 1 frames (Gain : 200) exposure: 10 s
-> No Flat
Stacking step 3 ->456 frames (Gain: 200) - total exposure: 1 hr 16 mn 0 s
RGB Channels Background Calibration: No
Per Channel Background Calibration: No
Method: Median Kappa-Sigma (Kappa = 2.00, Iterations = 5)
-> No Offset -> Dark: 1 frames (Gain : 200) exposure: 10 s
-> No Flat
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Mirror X
Background neutralization
Color Calibration
Asinh Transformation: (stretch=1000.0, bp=0.00100)
Asinh Transformation: (stretch= 3.0, bp=0.05363)
Histogram Transf. (mid=0.456, lo=0.012, hi=1.000)






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