The Fish Head Nebula is also known as NGC 1795. It is a small part of the [much larger Heart Nebula](https://i.imgur.com/Hf11FR9.png), which makes it look like a small peen with huge balls. This image I posted is just a 4k crop of what I find to be the most interesting part of the frame, but [here is a link to the original full sized image](https://live.staticflickr.com/65535/51710880437_fb8e66e09c_o.png). Also made a [starless version](https://i.imgur.com/yOQwhaI.jpg) to better show off the fainter structures in the image. Captured over 4 nights from November 16-23rd, 2021 from a Bortle 6 zone.
**Places where I host my other images:**
[Instagram](https://www.instagram.com/leftysastrophotography/) | [Flickr](https://www.flickr.com/people/leftysastrophotography/)
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**[Equipment:](https://i.imgur.com/6T8QNsv.jpg)**
* TPO 6" F/4 Imaging Newtonian
* Orion Sirius EQ-G
* ZWO ASI1600MM-Pro
* Skywatcher Quattro Coma Corrector
* ZWO EFW 8x1.25"/31mm
* Astronomik LRGB+CLS Filters- 31mm
* Astrodon 31mm Ha 5nm, Oiii 3nm, Sii 5nm
* Agena 50mm Deluxe Straight-Through Guide Scope
* ZWO ASI-290mc for guiding
* Moonlite Autofocuser
**Acquisition:** 17 hours 12 minutes (Camera at Unity Gain, -15°C)
* Ha- 62x360"
* Oiii- 55x360"
* Sii- 55x360"
* Darks- 30
* Flats- 30 per filter
**Capture Software:**
* Captured using [N.I.N.A.](https://nighttime-imaging.eu) and PHD2 for guiding and dithering.
**[PixInsight Processing:](https://www.youtube.com/watch?v=u7FuApFSGuA)**
* BatchPreProcessing
* SubframeSelector
* StarAlignment
* [Blink](https://youtu.be/sJeuWZNWImE?t=40)
* ImageIntegration
* DrizzleIntegration
**Linear:**
* DynamicCrop
* AutomaticBackgroundExtraction
* DynamicBackgroundExtraction
* EZ Decon (Ha only)
* STF applied via HistogramTransformaion to bring each channel nonlinear
**Combining Channels:**
* PixelMath to make classic SHO to RGB image
* SCNR to partially remove excess greens and magentas
* Pixelmath to make RGB image using [ForaxX's palette](https://thecoldestnights.com/2020/06/pixinsight-dynamic-narrowband-combinations-with-pixelmath)
> R= (Oiii\^~Oiii)\*Sii + ~(Oiii\^~Oiii)*Ha
> G= ((Oiii\*Ha)\^~(Oiii\*Ha))\*Ha + ~((Oiii\*Ha)\^~(Oiii\*Ha))\*Oiii
> B= Oiii
* Pixelmath to blend classic SHO and ForaxX SHO images 50:50
**Nonlinear:**
* LRGBCombination with Ha as luminance
* Shitloads of CurveTransformations to adjust lightness, contrast, saturation, hues, etc.
* MLT noise reduction
* LocalHistogramEqualization
> two rounds of this, one at size 16 kernel for the finer ‘feathery’ details, and one at 100 for larger structures
* Invert>SCNR>Invert with star mask to remove magentas from stars
* DarkStructureEnhancement
* More curves
* Extract L channel > LRGBC again for chrominance noise reduction
* EZ Star reduction
* NoiseGenerator to add noise back into reduced stars
* Clone stamp to remove 2 ringed stars I forgot about during deconvolution
* Resample to 70%
* Crop to 3840x2160 resolution
* Annotation
lefty7283
