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Writer's pictureTony Brown

Lion Nebula

Updated: Oct 11, 2022

Not one I was familiar with until I saw a rendition of this on Cosgrove's Cosmos (I recommend not just for the images but for the detail Patrick puts into the site!). Patrick tackles this with a Narrowband SHO filter set. My DSLR and Optolong l-enhance was always going to struggle to keep up with that but I'm pretty pleased with the result. It needs much more data the 7h28m I managed to grab on a single night at the end of September simply isn't enough. However in my social posts people did get it.


Capture

2022-09-27

30 Flats

10 Darks

126 Lights


Pre-Processing

After Filtering out for FWHM and wRWHM was left with 112, filters used: -

  • f = 3.3

  • r=0.8

  • w=5

Stacked 112 * 240s -Total Integration Time = 7h28m


Post Processing

Siril

  • Crop

  • Rotate 180 - Lion upside down!

  • Background Gradient

  • Colour Calibration Photometry

  • Deconvolution (1.2)

  • asinh Stretch - minimal (30,30,5)

  • Histogram Stretch

  • Starless and Stars created using Siril Pixel Maths and Starnet++.

  • Once we have a TIFF (16 bit version) of Starless move into PS.


Photoshop Processing

  • Levels

  • Curves

  • Raw - Highlights and Contrast

  • Raw - Texture

  • Raw - Clarity

  • Raw - Noise Reduction

  • Raw - Saturation and Vibrancy and Shadow


Create FIT version of TIFF file output from PS using Siril

Once back from PS then Pixel Math Add the Stars back into the FIT version of the Photoshop processed TIFF file.

Created JPG version


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