Watkins Microscope Optics
Body lenses: A: Eyepiece lens, plano-convex dia=1.6cm, f=2.4cm;
B: Field lens, bi-convex, dia=2.5cm, f=3.2cm.
B: Field lens, bi-convex, dia=2.5cm, f=3.2cm.
Objective lens carrier. There are 7 objective positions (arrow, numbered 1–7). The position is maintained in place by a spring detent (A).
| Position | Dia (mm) | f (cm) |
|
1
|
1
|
0.2
|
|
2
|
1.5
|
0.4
|
|
3
|
2.0
|
0.8
|
|
4
|
2.2
|
1.2
|
|
5
|
2.5
|
1.8
|
|
6
|
3.0
|
2.5
|
|
7
|
3.5
|
3.0
|
Lieberkuhns can be exchanged by screwing into a mounting bracket (A), the bar end of which slides into a slot at the base of the objective holder.