|
No.
|
Dia
|
f
|
Aperture
|
|
1
|
1
|
<1
|
0.5
|
|
2
|
5
|
3
|
<1
|
|
3
|
6
|
3
|
1
|
|
4
|
10
|
5
|
2
|
|
5
|
-
|
-
|
2.5
|
|
6
|
-
|
-
|
4
|
Objectives are labeled "1" - "6". All have a single biconvex lens.
The microscope optics consist of the typical lens systems: A: Eyepiece, B: Field lens, C: Objective lens.
Eye lens: dia=23mm, f=30mm
Field lens: dia=36mm, f=75mm
A
B
C
The microscope came with six objectives. All have single, biconvex lenses. Some are marked with number designations. Note the difference between the lens diameter and the aperture. Reduction of spherical aberration by reducing the light collecting aperture was typical for 18thC microscopes.
The high-magnification objective is an extremely small (<1mm) lens.
This low-magnification objective has a much larger lens.