Some screen shots at the link below - these show results of the Colour auto processing using Starry's Mask/Sample suggestion for each combination above. I used a very basic workflow - Autodev/Crop/Wipe/Autodev/Colour.
The 1st autodev is very interesting - bright blue/green and doesn't look right at all - I included an example - 3rd screen shot from the bottom of the attached. (I tried this with and without Flats/Dark Flats - no significant difference)
I have also spent a couple of hours researching how people get on with the IDAS D1 and oddly whilst there are some reports of processing difficulties most don't seem to have many issues. I think my next step will be to get out and take some rough short exposures of M31 without the filter and see how they compare.
At least if I can nail it on the filter I can then consider whether there are processing solutions, or perhaps whether I need to look at a different camera.
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