Jan Paauw microscope optics
A: Lieberkuhn reflector; B: Microscope mount and Field lens; C: shagreen-covered cardboard body; D: green eyepiece tube topped with wooden lens mount. Total length is 13cm.
Lenses: A: Objective (dia=10mm, f=10mm). Note the small aperture size; B: "6" field lens (dia=8mm, f=8mm) and mount; D: eyepiece (dia=15mm, f=17mm); Lieberkuhn dia=28mm.
Position of optical components:

A: Objective lens with aperture
B: Field lens with aperture
C: Drawtube aperture, wooden
D: Eyepiece lens