Axio Observer rear port magnification

[Rusty Nicovich]

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We have a Zeiss Axio Observer Z1 that we're trying to couple to a custom
illumination source.   Zeiss clearly is doing a few things in the rear port
of this scope with multiple lenses to get both a field and aperture
diaphragm inside the scope body (as opposed to Nikon or Olympus, which
rarely has glass between the rear aperture and filter cubes).

Before I go off and measure it, does anyone happen to know what the
effective focal lengths of these lenses?  Or a magnification between the
image plan just behind the rear port of the scope body and the field stop
image plane on this scope?

Thanks,
Rusty