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Thanks Chris, Werner, Marcus, Gary, Rich , Trevor and Craig.
The FOV is large but I am not sure how many arc seconds it represents.
I have an FSQ image of the same area and it does take in quite a bit more.
I blended the Ha and O111 this way:
Ha assigned to red channel, screen one duplicate layer to saturation one duplicate layer to luminosity
O111 same way except 2 lots of layers, one to blue and one to green (O111 is halfway between blue and green and should be teal green as the final colour) but only 1 luminosity layer which pulls down the star sizes a bit to match the narrowband and accentuates the nebula a small amount as well (easily overdone and it washes out the RGB colours).
So that makes 12 layers in total.
Greg.
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