I found M42 very challenging the other way around. I have since learnt it is a complicated processing nebula to capture as it requires multiple exposure lengths and the trick is to combine them through Photoshop.
I think it can be in GIMP but still learning. he only thing I need to do is achieve longer exposures as the longest I have done for M42 is 10 Seconds at ISO 1600 and the core comes out perfect. With longer exposures I believe I could do a really good one. One day
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