The optics of a late 18th Century compound microscope; the Oberhaeuser Drum Microscope
Modeling
  • Two eyepiece lenses (biconvex and plano-convex)
  • Detachable plano-convex mirror (missing)
  • Stack of three small objective lenses (bottom detachable)
  • Fine focus mechanism
  • No lens, three-aperture condenser
  • Plano-concave mirror
Magnification and Resolution
Measured Grating: 100 LPMM ->10 µm/line
Line width (picture) = 90 pixels
Camera: 1/1.8” CCD -> 13.1 x 17.6 µm/pixel
Resolution
Rayleigh Two-Point Resolution: Theoretical = 2 µm, Measured = 2.3 =µm