Optics consist of an eyelens (A: dia=14mm, f=20mm), Field lens pressed inside drawtube B (dia=11mm), and the objective (D: plano-convex lens, dia=3mm, f=2mm, aperture=1mm).
C: Body tube.
The objective consists of the single plano-convex lens (arrow) and the removable aperture cover (A).
The eyelens is plano-convex and mounted with the flat surface facing out.
Field lens inserted into the drawtube.