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Oil immersion operation
An objective on which “Oil” is displayed (a black band is also provided on the end) is an oil immersion objective. An oil immersion objective is used with immersion oil filling the space between the tip of the lens and the specimen. For oil immersion objective of the numerical number 1.0 or greater an oil immersion condenser is also used in order to obtain sufficient performance. The space between the tip of the condenser lens and the specimen is filled with immersion oil, the same as for the objective.
