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A 4" scope will struggle to get a good image, and you will need good seeing.
Can you detail your capture and processing routine and post an image?
As a rough recommendation, basically you will want to get focus on a nearby star, use a bahtinov mask or similar to achieve as good a focus as possible, then slew over to saturn.
Capture a good few thousand frames for stacking, and then stack them in Autostakkert. Take the stacked image from autostakkert and process it using registax wavelets.
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