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Ingo,
Try much longer exposures at least 1 minute sub-frames, preferably 5 minutes.....and yes this means you require a mount that can track. Use the camera's built in noise reduction. ISO 400 to 800 is fine.
Most camera lenses will not perform very well wide open, so no matter what lens you are using, close it down two stops (but sure you are free to experiment here).
DSLR's don't like ubran skies. You'll need to find a darker country sky to boost the S/N in your images.
Cheers
Peter
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