C: Eyepiece lens, dia=10mm
A: Objective lens, dia=8mm. Aperture diameter appx 2mm
The small objective aperture was used to correct for spherical aberration. Note the retainer spring used to hold the lens in place.
The small objective aperture was used to correct for spherical aberration. Note the retainer spring used to hold the lens in place.
There are only three lenses. All are simple biconvex optics.
B: Field lens. Dia=25mm
