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Lovely image Chris.
Star colours is the area I find these CMOS cameras weak in general and an area that really needs to be watched compared to CCD.
I am not sure why but many of these CMOS based camera images share this characteristic and the more colourful star images on Astrobin are invariably CCD cameras.
One approach that seems to work and is common with DSLR imaging is to use shorter exposures for the stars.
Its like imaging with too high an ISO with a DSLR. The stars end up all white with no colour.
It probably has to do with the fact that you can adjust gain on a CMOS which is most likely a lot higher than that on a CCD which then blows out the stars quicker than normal. The pixel sizes are also usually smaller to meaning smaller wells that fill more quickly (also due to the high QE of most of these sensors - not so much the 1600 though).
Greg.
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