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Thanks everyone for the comments.
Mark (batema), I used my old planetary workhorse, the 405 Dall-Kirkham which has 6500mm focal length and an ancient Barlow working at about 1.7x.
Maurice, I captured 2 minute avi's for each colour at 30fps and stacked 600 from each.
For Saturn I ran at 15fps for 4min and used 800 frames.
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