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Thanks for the nice words folks
Paul I do well remember your fine shot of the area.
I too struggled to battle with noise, but the much longer total exposure-at least in theory should have vastly improved the S/N
The other thing I found was that using any stretch function in IRIS just didnt provide enough control..it was adding noise and clipping highlights..so after aligning, stacking (kappa Sigma) in IRIS -and applying the magnificant subsky function to fight gradient I did all the rest of the processing in Photoshop
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