Great effort Peter. Your processing looks pretty good too. As David said, capture as many frames as you can in your 2 minutes which isn't too bad a length of time for that size scope on Saturn. The conflicting thing is also to try and keep your exposure short 10ms or less is considered good, but the trade off is increased gain. For focusing try changing the gamma in the preview window to make the image more contrasted and focus on the boundaries, the Cassini ring is a pretty good choice for focusing Saturn. In Firecapture make sure you turn the gamma off again before capturing.
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