Thanks folks, I appreciate the feedback :-) Updated image with an additional 130mins of 60s subs; still using the ALP-T Ha-Oiii filter. Applied a light HOO palette and hence the bluer core. Other than that the changes are subtle ... slightly nicer colour (IMHO), more detail in the gas/dust clouds and less noise. I'll have one more go at M42 using my new ALP-T Hb-Sii filter and then have another go in Dec with my mono cam and 82ED. Alex
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