What is the working distance of the Microscope lenses 1x, 2.5x,4x for the SC systems?

Here are some optical data:

 Objective   Working dist.  F# of Object Side  Depth of Field +/- in microns
 4 X  12.7mm  0.66  3.4848
 2.5 X  25.4mm  0.94  7.0688 
 1 X  60.3mm  2.4  46.08
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