Thanks everyone, I tried to equalise ADU value for each narrowband at 5,000 to 6,000 value but O3 was often more. I really could do with an ST10 for wider field with these nebulas. F4.5 does save so much time though.
It is really great shot. So beautiful this image.
I forgot to ask you, why the halo is red around the stars in your first image and blue in the second image ? But I think it is the same image !
Best regards.
Franck
