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Hmm taking flats the traditional way with the solar scope would be quite hard, as I tend to fine tune the etalon once on the sun to highlight certain features and this moves the hot spot. Thats why I was looking at using the blur / invert functions to create a mask from the brightness of the actual image. I Just have to read up on the right way to apply the adjustment layer to effectively remove the gradient. I might try applying it as a flat in AVIStack.
As my lunt is a Double stack, I have a spare LS50F and blocking filter. I could also investigate what is needed to fit it to my ED80 one day.
Regards
Bill D
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