Back on thread,
Benno, get a cheap 80mm Guidescope and get out there imaging. It will at least teach you heaps. Most "oldies" at astroimaging have been through the guidescope phase for the film days. I still use one frequently.
You will learn terms like "flexure" and "missalignment"
and learn how to overcome them. All building towards better and better images.
When you have finished with the guidescope you can flog it off to somebody else just beginning.
Give it a go.