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

Here are some optical data for SCxxxx microscopes: 
                                    

 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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