Microscope No. 69 lenses

There is only one objective lens with this instrument. It is stamped "#3". f=1.5cm, dia=7mm

Note the small aperture (2mm) relative to the lens diameter. A small aperture is used to reduce spherical aberration.



		Lenses: A: Eyepiece lens (f=3.5cm, dia=1.5cm); B: Field lens (f=7cm, dia=2.8cm); C: Objective Each optic is a single, biconvex lens.

	There is only one objective lens with this instrument. It is stamped "#3". f=1.5cm, dia=7mm Note the small aperture (2mm) relative to the lens diameter. A small aperture is used to reduce spherical aberration.