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That’s great, thank you, Raymo. I can immediately see a colour difference between Betelgeuse and Bellatrix and of course Rigel. There is the (extremely) slightest hint of colour at the upper left (west) of M42 but I believe this to be the mottled appearance of the background noise, (zoom in). I think another few seconds per sub exposure is required to capture colour in M42 with all else being equal and this then may require tracking to avoid star trails but worth experimenting either way.
Before you turned the colour saturation down to zero did you notice any colour in M42 in the combined images that was part of the nebula and not any processing artefact?
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