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Doug try using the the HA and O3 this way
HA to red 1
O3 to green 0.5
O3 to blue 0.5
Since O3 is a cyan colour it actually effects the green and blue channel of a OSC equally.
The detail in the nebula is very very good. This optic looks like a very good one. The problem with F10 is that the stars very quickly saturate even with a sixteen bit sensor way before you get a decent nebula signal.
If you look at the dimmer stars they have very good colour because they are not saturated. Your bright stars are also far bigger due to massive overexposure. There is nothing wrong with your sensor or optics it is just the laws of Physics.
If you have time and you feel so inclined can you collect RGB at a quarter of the exposure of the RGB image. Send me a tiff crop of each different exposure set of the same area and I will do a HDR for you.
See the picture below it is a line profile done with Images Plus. Even the blue star in the centre of the Helix is saturated. HDR would overcome this.
I am only trying to help. You are well on the way to producing stunning images. The Helix Nebula is very dim and you have got very good nebula signal and detail in your image.
Bert
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