The microscope optics consist of a collector lens (A) condenser lens (B, and below), and an objective with ganged lenses (C).
The objective consists of two ganged simple lenses marked with a "dot". Inner lens dia=5.0mm, f=20; Outer lens (dot) dia=5.0, f=8.
The collector lens at the base of the microscope body. Dia=43mm, f=265mm
The condenser lens is mounted to a rack and pinion mechanism (R) that allows the sunlight to be condensed directly onto the sample. Dia=16mm, f=18mm