I captured M42 back in January at a Starizona Star Party. It was my first DSO image that I shot with my new rig.
This was my 2nd attempt at M42 using GHS and HDRMT. 450 5s subs unguided using the C8 Hyperstar and Antlia Triband RGB Ultra filter. I did notice some walking noise which I believe is due to not using guiding and the short exposure time. I plan to capture M42 using guiding and dithering to compare.
Here is a link to the image in my Astrobin gallery
https://astrob.in/okc06a/0/