Huygenian eyepiece: Top lens dia=10mm, f=20; bottom lens dia=22, f=40.
Objectives all consist of two lens systems, a distal plano-convex lens and a proximal achromatic doublet.
One lens also has this screw-on Lieberkuhn reflector for viewing opaque specimens.
Prism assembly for binocular imaging. The two opposing prisms split the light from the objective to enter the two eyepiece tubes.
The objective collar (L) accommodates the objective and the binocular prism assembly.