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What is the highest numerical aperture for a “dry” objective (which requires air between its front lens and the specimen?

April 26, 2017air aperture dry Highest Lens numerical Objective requires specimen

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What is the highest numerical aperture for a “dry” objective (which requires air between its front lens and the specimen?

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The highest N.A. for a “dry” objective is 0.95. If such an objective is meant to look through a cover glass, it must have a correction collar. If such an objective is designed for uncovered objects, e.g. smears or metallurgical, it will not require a correction collar.