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Hi Andreas and Raymo,
Hope you don't mind me entering the conversation.
Andreas, when a target is in focus in your 'scope's e.p. the focal point/plane of your telescope is coincident on the focal plane of the e.p. In this way, the rays emitted from the e.p. are parallel and so you can obtain a projected image. An eyepiece is designed so that the light rays being emitted when focussed are parallel, that way the eye is totally relaxed and focussed on infinity. (Very important for people who spend a lot of time looking through a microscope e.p.)
Suggest you try and determine where the focal plane is on your telescope by pointing it at say, the moon and placing apiece of card at the e.p. end and finding where you have to put it to get a sharp image. This is the point at which your e.p. should also focus an image if say, for example, you allowed an image of the moon to focus on a piece of card. You should now know the correct spacing between e.p. and scope to achieve focus. Fiddle with the tubes etc. that you have to accomplish this.
Hope that's of help.
Robert
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