Swift & Son objective

There is only one objective with the microscope.
It is a 2/3" lens.
The objective has two plano-convex lenses. The front lens (L) is 7mm in diameter and has a focal length of 12mm. The back lens is 12mm in diameter and has a focal length of 28mm. The two lenses are placed 16mm apart.

In the base (far R) there is a 7mm aperture.

Swift & Son Eyepieces

The microscope has two Ramsden eyepieces. Each has two lenses placed with the flat surfaces facing out, and 15mm apart.

Back lens: dia=28mm, f=62mm

Eyelens: dia=15mm, f=40mm.