By using it in combination with a microscope,
you can change the magnification and working distance.
0.75x auxiliary lens
Z-0.75
Magnification: 35x to 200x
Working distance: 113mm
1.5x auxiliary lens
Z-1.5
Magnification: 65x to 390x
Working distance: 52mm
2.0x auxiliary lens
Z-2.0
Magnification: 90x to 480x
Working distance: 39mm
The auxiliary lens is attached to the tip of the lens.