Objectives 1–4 are mounted in a brass conical holder fixed in place by a brass retaining ring. Objectives 5 & 6 are larger and fixed in place by a threaded brass collar.
No.
Dia
f
1
1mm
2
2
2
3
3
3
5
4
4
7
5
4
15
6
4
15
Objectives for the screwbarrel attachment to the Solar microscope. They are screwed into the top of the attachment (A, below).
Screwbarrel attachment optics: A: eye lens; B: accessory magnification lens. Shown here with the glass phial sample holder.
Accessory magnification lenses for the screwbarrel attachment. These lenses would be matched to the appropriate eyelens.

1&2: dia=9mm, f=10mm
3&4: dia=11mm, f=20mm