What is a No-cover glass or NCG or NC objective?
Such an objective has been designed to look at a specimen which is not covered by a cover glass; e.g. a smear. At numerical apertures above 0.45, such an objective will yield images free of spherical aberration when smears or other uncovered specimens are examined. Metallurgical objectives are almost always designed for looking at uncovered objects; e.g. polished metals, wafers, etc.
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