Chromatic abberation APO objectives

I was wondering if any of you have a rough estimate on the specs for Plan-APO objectives when imaging for instance using a 488 and 633 nm laser.
Basically what is the best possible values one could achieve in XY and Z overlap (given the right immersion, embedding etc) with respect to the size of the PSF.

The companies often give a qualitative statement but no real numbers.


This website has examples of axial chromatic shift in lenses with apochromatic (3 colors) and super-apochromatic (4 colors) corrections:

Lenses with identical specifications will show different chromatic shifts, so it makes sense to get several lenses for testing and keep the best one.