Microscope optics consist of A: Objective lens; B: field lens, and single biconvex eye lens. At the top is a brass shutter-cap. The cap was described by Culpeper as a "Slyding-Head".
The Field lens (dia=38mm) is placed at the distal end of the L.v. eyepiece assembly.
The objective lenses are marked with notches. They are all biconvex.
| Diameter | Focal length | |
| I | (No lens) | NA |
| II | 4mm | 4mm |
| III | 6mm | 6mm |
| IIII | 6mm | 11mm |
Included with the microscope are these three leather objective cases.