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Very good result Tony. How do you take your flats? I now always point the lens or telescope to the zenith of a twilight sky when taking flats. Make sure the Sun is below the horizon and there are no thin clouds. I have found any where else that the sky has gradients which show up even worse with wide lenses. This makes the flats almost useless.
Get rid of the ersatz linear diffraction artefacts and it will be even better.
This cooling mod looks extremely worthwhile.
Bert
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