by your method, only keeping the dew shild retracted, the Altair Wave Series 125 EDF F7.8 APO Binoviewer ready 3.7" R&P Focuser is significantly shorter then my 120ED.
That would also imply my 120ED is about the same size as my 152ED.
Thats pretty awesome!!
..Ralph
I just measured my 120 mm Eon. In it's case, it's 31.5 inches in length. That's significantly shorter than the 120mm Skywatcher which is 36 inches long.
Jon