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The condensers of various upright and inverted microscopes. The positions of irises and other components vary depending on the manufacturer and model.
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Alignment Procedure
Focus on the specimen using a low power lens like a 10x air. Fully close the field diaphragm and adjust the condenser focus so the image of the iris is in sharp focus. Centre the image of the iris using the two centring screws. Open the field diaphragm until it is just outside the field of view.
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