NGC 2174 - aka Monkey Head Nebula.

This is the first image I've taken with a Skywatcher Quattro Coma Corrector. It's done a good job with my f/3.9 newtonian. My previous coma corrector was a Baader 2" MPCC Mark III, I still had some coma in the corners.

The updated image was taken with the same color camera and an Optolong L-eXtreme dual band filter. There is much more detail in the nebula at the bottom of the monkey's head. This was taken over two nights with the moon way too close. Total of 6 hours of imaging.

PixInsight Processing for the original image

-> Blink - remove bad frames

-> SubframeSelector - analyse frames for FWHM, # of stars, Ecentricity etc

-> ImageCalibration - use calibration frames to help remove fixed patterns etc

-> CosmeticCorrection - fix hot and cold pixels

-> Debayer - fix the colors before allignment

-> StarAllignment - registration to align the images.

-> LocalNormalization - normalize the images to reduce gradients

-> ImageIntegration - combine all the images into one !

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-> DynamicCrop - get rid of overlapping around edges

-> Even R,G,B colors -

ChannelExtraction - separate Red, Green and Blue channels

LinearFit - make all three channels the same intensity

ChannelCombination - Put the channels back together

-> AutomaticBackgroundExtractor - reduce unwanted colors in background

-> SCNR - get rid of unwanted green in image

-> BackgroundNeutralization - equalizes the average red, green and blue components

-> ColorCalibration - calibrate colors based on a neutral background

-> Create two masks, 1=luminance mask, 2=further stretching of 1

-> MultiscaleLinearTransform - denoise using mask 1

-> ACDNR - further denoise if needed

-> Stretch using ScreenTransferFunction and HistogramTransformation

-> StarMask & MorphologicalTransform to reduce star size

-> StarNet++ - Create Star Mask and remove stars from image

-> HDRMultiscaleTransform - using mask 2

-> CurvesTransformation (mask 2)- luminance, saturate, RGB/K

-> LocalHistogramEqualization (mask 2) - bring out structures

-> UnsharpMask (mask 1) - give edges more contrast

-> StarNet++ & PixelMath to put stars back in image.