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Happy to help where I can Peter, though there are others here with much more experience than me. How do you find focusing with the DSLR, and do you have manual or motorfocus. I only ask because I thought the image a little soft for a night of good seeing? And I have difficulty focusing DSLR's. But it could be any one of many things.
The misalignment of RGB suggests a low elevation ? Ah! I see that from Baltimore Saturn had only about 20 degrees elevation, is that right?? If so that would explain a lot, and in that case a pretty good job.
Collimation and Tube currents can also affect your image.
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