![]() ![]() "Plan" designates that these objectives produce a flat image across the field of view. ![]() Plan Achromat and Plan Apochromat Objectives Note that if an immersion or dipping objective is used without the immersion medium present, the image quality will be very low. ![]() Water-immersion (coverslip) objectives are designed to work best with a drop of water between the objective and specimen, while water-dipping objectives are designed to interface directly with the specimen. Oil immersion is required in order to achieve numerical apertures greater than 1.0. Oil-immersion objectives require the use of a drop of immersion oil (such as MOIL-30) between and in contact with the front lens of the objective and the cover glass. Dry objectives are designed to work best with an air gap between the objective and the specimen. This designation refers to the medium that should be present between the front of the objective and the cover glass of the microscope slide. This guide describes the features and benefits of each type of objective. Thorlabs offers several types of objectives to meet a variety of experimental needs. ![]()
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January 2023
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