And if Bojans explanation still doesnt register, then think like this..
Lets say the camera with its lens is focused for infinity, your telescope mirror or lens without and eyepiece is NOT. If your eye is focused at infinity and you look into a telescope without an eyepiece, what do you see ?... Krapola. This is what the camera will see too. But placing an eyepiece in produces an image at infinity (If focused correctly), then your eye or camera will see the image correctly and in focus.
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