P3D Realist Lenses

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   Anyone on here have a rundown on the various types of lenses that
appeared on the Realist cameras? My 3.5 has "David White Anistigmats"
while my 2.8 model has "David White Germany" on it. I have also heard
that there are Ilex lenese on Realists.
   So what was the major differences on these old lenses.(I am aware
of the difference between the 2.8 and 3.5 but I would like to know
more!)

  Thanks,

-Fred Sole