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Colour is good. The 183 has 2.3 micron pixels which are very small and best suited to a short focal length scope.That scope with those pixels gives you 0.24 arc secs/pixel. Ideal is 1 arc sec/pixel with average seeing of 3 arc seconds. (that simply means you get 3X sampling of the object).
0.24 is going to require mountain top type superb seeing to work well. What you will notice is that images look soft and not sharp.
But if you used 2x2 binning you would get a better result. But even then at 0.47 arc secs/pixel you will require good seeing.
I was imaging at 0.52 arc secs/pixel last weekend and I got good results which surprised me. That was with 3.76 micron pixels.
You should get a nicer result with your QHY268C especially if you bin 2x2.
Pixel size should be matched to the scope's optics for the seeing and the focal length. Its more of a guideline in my experience rather than hard fact.
Greg.
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