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| Lighting attitudes after A. Koehler |
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This is where Köhler illumination really begins: we narrow the luminous-field diaphragm and move the condenser carefully up and down via the condenser drive until we see a sharp image of the luminous-field diaphragm, or at least a piece of it in the edge. If this does not work at once, we set different diameters of the luminous-field diaphragm and move the condenser again until a piece of the edge of the diaphragm appears in focus somewhere. In most cases, this search will take some time.
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