The body tube accommodates a single planoconvex eyelens (dia = 11mm, f=35mm) and an embedded field lens (at the position of the arrow). Field lens dia=25mm, f=60mm. A: Camera Lucida accessory.
The objective consists of a lens double (A) and a double-lens insert (B).
The lens does not require a coverglass on the specimen "Uncov'd"