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Roger,
Yes and No.
You are correct that the focusing mechanism must be able to "travel" through a distance to allow the eyepiece/ camera to be positioned at the focus.
The "body" of the focuser is attached to the tube of the telescope, and a "tube" moves through the focuser body to achieve the above.
If the space between the body and the focus is very small then it causes problems - the eyepiece/ camera may not fit in the available space.
Likewise if the space is too large the "tube" may not be long enough to position the camera/ eyepiece at focus.
A telescope with a good "prime focus" position would normally allow the camera and or eyepiece to be easily positioned between the focuser body and the focus.
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