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From the responses I've several areas I need to improve.
1. Some stars in the corners are not as well formed as I would like. I think I need to look at the backfocus from the flattener.
2. I appear to be loosing colour in the stars when I stretch. I'll try to find a better workflow to maintain colour throughout processing.
3. I will reduce exposure time to 120 sec and increase the number of subs. Less blown out stars and more detail in the nebula.
4. I'll try masking the smoothing to reduce the smoothing around the galaxy. Also reduce the amount of smoothing generally.
I'm also thinking of shooting some shorter subs with a dual-band filter and then use the Ha component as the luminance for the stars in the RGB image. This Ha lum would give me smaller RGB stars and be less likely to be "blown out". It tried this out on some other data I had and the results look better.
Thanks all for your comments.
Chris.
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