Thanks for your replies.
I have been using black and white so far, but the final result is very dependent on the selection of the star.
I will try doing colour separation from a G2 star as Terry B suggested when the clouds finally clear over Perth.
Regarding comment from the other Terry (commetGuy), unfortunately D70 and D80 have different sensors so the coefficients will be different.
Also a bit more of searching suggested 1.9/1.0/1.4 as good starting values but experimenting with them is a real pain as there is no undo in Iris.
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