Microscope optics. A: Huygenian eyepiece; B: biconvex field lens; C: objective snout; D: objective lens
A: Eyelens dia=16mm, f=34; field lens dia=20, f=52
B: Field lens dia=40mm, f=59mm
The objective snout is engraved 1–6 (notice the erroneous "3" where "5" should be).
A: Eyepiece is of the Huygenian type.
B: The field lens is mounted in a separate brass insert.
dia
f
aperture
0
5
3
2
1
6
6
2
2
7
13
2
3
8
20
3
4
9
23
3
5
10
29
4
6
10
38
4
Objectives are typically one biconvex lens set in a blackened brass mount. The small aperture reduced spherical aberration.
The Lieberkuhn press-fits into a brass cylinder, which then fits over the objective snout.