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you've made a good start, and you can get much cleaner detailed shots with the gear you have and no additional costs. basically you want to start learning to align and stack shots to reduce noise and then wavelets to bring out detail. You'll be blown away by just how much detail you can get if you are patient.
simplified:
- take lots of photos like you have done or a video during a 3 minute period (the larger planets are rotating so longer timespans can reduce possible details.). this is signal collecting, collect as much data as you can quickly.
- install PIPP (free) and run your video or photos through it an center object and probably crop the output to a small resolution to save space (unless you are getting moons, you should keep them). and output to bmp files. This makes up for not having tracking, you should end up with a series of uncompressed (no added artifacts) black images all the same size with saturn in the center.
- you can now dump these into Registax (also free) to stack and combine, then use the wavelets feature to bring out the details.
There are many ways you can go about using what you have and getting better results in the end which are so much better than you get out of the camera. but the above steps will get you good results. don't worry about correct exposure in camera, after aligning and stacking the image has plenty of data to bring up the exposure. look at trying autostakkert and DeepSkyStacker (both free) as well. you end up using lots of different programs for different things in astrophotography so give them a go and learn to be patient, until your data gets to the wavelets stage it'll probably still look crap but dont give up. experiment and have fun!
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