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Thanks all. The feed back is really appreciated. Yes, agree, the core is a bit too bright. Nikolas has provided an idea that could be incorporated into the auto develop process without too much trouble. Colour calibration needs a bit more work.
Glen. I find it preferable to take flats at the lowest camera ISO and match up the bias ISO. The master bias and master flat are then combined using noise reduction strategies. It's an old technique and works well for older cameras - less noise in the calibration frames, less contamination of the light frames. Newer CMOS sensors tend to less noise.
Kevin. The camera has a uv/ir astronomical filter, but it tends to Red moreso than others I've used over the years.
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