Leo Triplet

Shotdate: 24th March 2012

Camera: Nikon D3x

Optics: Celestron 9,25" Edge HD

Mount: SkyWatcher NEQ6 Pro

Guiding: LVI SmartGuider 2

 

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DeepSkyStacker settings:

 

Stacking mode: Standard

Alignment method: Bicubic

Stacking 18 frames @ 5 minute exposure (ISO: 1600) - total exposure: 1 hr 30 mn 0 s

 

RGB Channels Background Calibration: Yes

Method: Kappa-Sigma (Kappa = 2.00, Iterations = 5)

 

Offset: 108 frames exposure: 1/8000 s

Method: Kappa-Sigma (Kappa = 2.00, Iterations = 5)

 

Dark: 8 frames exposure: 5 mn 0 s

Method: Kappa-Sigma (Kappa = 2.00, Iterations = 5)

 

Flat: 50 frames exposure: 1/1 s

Method: Kappa-Sigma (Kappa = 2.00, Iterations = 5)

 

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Processing: PixInsight 1.7 and Photoshop CS5

 

ScreenTransferFunction

DynamicBackgroundExtraction

HistogramTransformation (Took 5 iterations at midtones value of 0.3333333 and saved each step)

HDRComposition

HistogramTransformation

Extracting CIE L* component for a mask

CurvesTransformation with L-mask

HistogramTransformation

ACDNR

Done