Shot and mostly processed this back in April, and then kinda forgot it was sitting on my hard drive until recently. Overall I'd consider this an improvement from my last attempt at M104 [three years ago](https://www.reddit.com/r/astrophotography/comments/be7qzz/m104_the_sombrero_galaxy/). Captured on April 22nd and 23rd, 2022 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/ejpKkwU.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:** 4 hours 23 minutes (Camera at Unity Gain, -20°C)
* L- 90x90"
* R- 29x90"
* G- 28x90"
* B- 28x90"
* 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:**
* BatchPreProcessing
* SubframeSelector
* StarAlignment
* [Blink](https://youtu.be/sJeuWZNWImE?t=40)
* ImageIntegration
* DrizzleIntegration (2x, Var β=1.5)
**Linear:**
* DynamicCrop
* DynamicBackgroundExtraction
* EZ Decon/Denoise (lum only)
* ArcsinhStretch + HistogramTransformation to stretch nonlinear
**RGB:**
* Channelcombination to combine monochrome images into RGB image
* PhotometricColorCalibration
* Slight SCNR Green
* HSV repair
* ArcsinhStretch + HistogramTransformation to stretch nonlinear
**Nonlinear:**
* LRGBCombination with luminance
* LRGBCombination with luminance again, inverted background mask used to protect galaxy from chronicance noise reduction
* Shitloads of CurveTransformations to adjust lightness, saturation, contrast, hues, etc.
* MLT noise reduction
* LocalHistogramEqualization
* Little bit of NoiseXTerminator
* More curves
* Resample to 80%
* DynamicCrop
* annotation
lefty7283
