Quote:
Originally Posted by Stonius
I wonder then why it is that my eyes can focus from 20cm to infinity, while the in-focus range of a telescope is only very narrow?
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The telescope and eyepiece are presenting the eye with a virtual image. The eye can accommodate minor imperfections in the virtual image but it can't change the focus of the telescope/eyepiece optical system. You have to do that by adjusting the spacing between the objective and the eyepiece.