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Thanks Alex
Hello Alex,
Focus was good, not by a mask but by getting the best spider vane diffraction spikes in the Canon live view and checking in Nebulosity preview on B Crux, near the target.
I think you are on the right track about exposures, The 7 minute exposures are ok but the poorer guiding let me down. I did take a series with 6 minute exposures but they seemed under exposed. Perhaps I should have another go at processing the 6 minute set.
Again thanks for your input.
Chris
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