The Sterrop tripod microscope optics consist of the standard three biconvex lenses: A: Eye lens; B: Field lens;
C: Objective

Eye lens dia=19mm, f=35mm; Field lens dia=35mm, f=75mm,

The top object is a brass live box.

Below are three of the included four objectives. They are stamped "1", "2", "3", and "4".