Cave Nebula in H-alpha

[cfinn]

This is 8 hours on the Cave Nebula in H-alpha with my Esprit 120, 0.77X reducer and QHY 268M captured over the last couple of nights.

The plan is to add RGB and maybe Luminance as well to create a natural colour image, as I would like to highlight the numerous reflection nebulae in the area.

In terms of processing, I stacked in APP with Drizzle droplets at 1.35 pixels, which is equivalent to fractional binning since I was slightly oversampled given the seeing conditions and my guiding errors (average around 0.65" RMS). I then ran deconvolution using the EZ processing suite in PixInsight followed by Russell Croman's excellent NoiseXTerminator (denoise=0.5, detail=0.15) whilst the image was still in a linear state. Back into APP to run an auto-stretch then into Photoshop to apply a little sharpening with APF-R. I finished off in PixInsight with a light application of HDRMultiscaleTransform to recover some detail in the bright central area of nebulosity, again using the EZ processing suite.

Comments and feedback welcome.

[MartinB]

Looking good and well worth adding the colour data