The microscope optics consists of an eyepiece (A) and an objective (B). There is no field lens in this instrument. The assembled body is 14cm.
The eyepiece consists of two lenses. The top eyelens dia=19mm, f=25mm. The lower lens dia=12mm, f=38mm. They are separated by 3mm.
There are two objectives: A: High-magnification, stacked lenses; B: low-magnification single lens.
This objective has two plano-convex lenses that can be screwed together for additional magnification. The lenses are identical: dia=4mm, f=10mm.
This low-magnification objective has only one plano-convex lens. dia=4mm, f=5mm, aperture=1mm