Our SM series microscopes have an object distance of 100 mm. If this is not enough, you can increase the working distance of the microscope with a reduction lens to leave more space underneath for working. It is also possible to increase the magnification. The table below shows how much the working distance varies when using each of the ballast lenses.
| Elevening Lens | Distance |
| 0.5x forward magnification | 165 mm |
| 0.7x pre-lens | 120 mm |
| 2x front lenses | 30 mm |