350522, G02B 2100
A device for checking the adjustment of the light source in an incident light microscope includes a centering cylinder having a configuration similar to an objective which is set into the revolving lens turret and can thus be moved into the path of the illuminating beam. The centering cylinder has a bottom plate with markings, for example, in the form of concentric rings and cross-hairs, located approximately in the rear focal plane of the lenses. The light source is thereby imaged on the markings. Observation is effected through an orifice in the jacket of the centering cylinder, which may be rotated around the optical axis. Focusing and adjustment may then be affected by adjusting the collecting lens and/or the lamp housing.
patent: 3833282 (1974-09-01), Kappl et al.
patent: 4168429 (1979-09-01), Lough
Corbin John K.
Ernst Leitz Wetzlar GmbH
Kent Lynn V.
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