Hi Peter,
David Malin's images seem to be all red too.
What about this image?
http://www.wolaver.org/Space/carinanebula.jpg
http://www.wolaver.org/Space/carinanebula.htm
Quote:
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This image shows a giant star-forming region in the southern sky known as the Carina Nebula (NGC 3372), combining the light from 3 different filters tracing emission from oxygen (blue), hydrogen (green), and sulphur (red). The color is also representative of the temperature in the ionized gas: blue is relatively hot and red is cooler. The Carina Nebula is a good example of how very massive stars rip apart the molecular clouds that give birth to them. The bright star near the center of the image is Eta Carinae, which is one of the most massive and luminous stars known. This picture is a composite of several exposures made with the Curtis-Schmidt telescope at the Cerro Tololo Interamerican Observatory.
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Oxygen is giving the blue colour which means my DSLR camera is not lying.
It's true however that a DSLR doesn't have good quantum efficency at Ha .
It's also true that blue should be there in your data.
Don't get me wrong.
You have taken a fabulous picture - that I could only dream of taking.