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I like how it looks so far... Really interesting target! I must have a look for it myself.
If this is going to be your lum, I would sharpen it up a bit, process it to perfection... then take the original stacked file, process that a fair bit gentler, and dont worry about having it super sharp, as this will be a colour layer, it doesn't need to be excessively sharp or detailed, it just needs to be strong data... In an LRGB, HaRGB, HaSHO etc image, the luminance layer is where the image gets all its detail, sharpness and structure, think of the RGB layers as simply a set of crayons with which you will colour in your drawing preformed with the fine liner (luminance)
I have not done full NB coloured images, however I've used Ha data as a Luminance for my a few of my images, and thats how I've always understood the process. Luminance needs to be quality quality data ( like what you have here..) colour images dont have to be anywhere near the same quality. A lot of people will take their luminance at bin 1x1 for best resolution, and take their colour subs at bin 2x2 or even 3x3 as the resolution doesnt matter too much. You're just looking for colour.
I used to bin 2x2 using my QHY8 for Ha imaging as you get a lot more sensitivity, and the resulting image is monochrome. What I later found out was that doing this halves your resolution for starters, and your resulting image will be noisier.. The bayer matrix on your camera, like with the QHY8 assigns some pixels as Red, green and blue. Even when you bin 2x2, these pixels are still only sensitive to their assigned colour even if the resulting image is monochrome. You will achieve a cleaner image if you image narrowband bin 1x1, and then once you've stacked your colour images, for Ha, take out only the red channel.. When you do this, take a look at the green and blue channels, they will be nothing but noise. Thats because the Ha filter is stopping green and blue light hitting from getting to the sesnor. so by just using the red channel, you're removing a lot of the noise, and getting an overall better Ha image to use as a luminance for your final image.
Cheers.
Alex.
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