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Thanks all for your comments. I actually shot this without an LPR filter as it is at f/9. I just maximised the signal to noise of all three colour channels and ended up with this image. I am sure that the colour balance is being affected by the inherent light pollution at my suburban site.
What is really interesting how well the TAL200K does at resolving the objects in the field. The curved spiders also do not introduce annoying diffraction spikes but 'fuzzy' flairing around the brighter stars. The HDR method is the major reason why you can see the two lobes of the Homunculus around Eta as well as all the faint nebulousity.
Below is a HDR from 2,4,8,15,30 sec exposures of Eta and a Hubble image animated gif. These were taken on the same night as the large image.
Bert
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