Hi Morton
You are probably kicking yourself a little over this circumstance (as you had this EP) but based upon your refined criteria the best choice would be one of the Nagler Zooms which have about 10-12mm ER and can reach the optimal magnification. Indeed, give some particular thought to the 2-4 Zoom as at these high powers very fine adjustments are critical and thus the 2-4 Zoom is more gradual for such fine adjustments than the 3-6. The Radian is a nice EP but its key strength is the 20mm of ER - optically things like the Nagler Zooms or Pentax EPs are better
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