The four additional objectives are stored in the bottom drawer in circular slots labeled "1" through "4". The objectives themselves are inconsistently labeled with dots. All objectives are single, bi-convex lenses:
|
Objective
|
Designation
|
Lens diameter (mm)
|
lens focal length (mm)
|
|
|
1
|
1 dot |
3
|
6
|
X
|
|
2
|
(No marking) |
1
|
3
|
|
|
3
|
3 dots |
2.5
|
12
|
X
|
|
4
|
4 dots |
3.2
|
16
|
|
|
(5)
|
4 notches |
(lens missing)
|
NA
|
Passemant microscope optics
Eyepiece (18mm dia)
Field lens
Objective
Position of the three optics: eyepiece, field lens, and objective. Total height of the microscope body is 16.5cm.