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Gday Frank
I have just starting doing this so i am not experienced but as I understand it is just time. 2x2 binning is more sensitive than 1x1 and thus you can image fainter objects in the same time.
Software like DL allows compositing an LRGB image imaged 1x1 Lum and 2x2 RGB. As the RGB just forms a tone map, resolution isnt the hiogest priority. In fact I run a median filter over my RGB channels then obtain all the sharp detail in the 1x1 binned Lum or Ha (or combination of both) that I am using as a Lum.
Others may be more eloquent but this was what I gathered by research prior to using it. I hope to show the results after the weekend on an LRGB on that NGC3576 I am hoping to take (weekend looks good up here - yahoo)
Mark Bolton
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